June 2014 Update

 

PYRITE CUBES IN PHYLLITE

This material was field collected during road construction in the mid 1980’s and stored as “bulk rock”.  After two weeks (several long days) of trimming and preparation work they are ready to sell as attractive mineral specimens.  A few have cubes reattached because they popped loose, but only a few.  The white sometimes seen along the contact between the cube and the rock, phyllite, is fibrous quartz.  This is a rim (not glue, or crystal alteration, or anything else) and is discussed in a February 2013 letter to Rocks and Minerals Magazine by Dr. Peter Richards.  He notes:

“In 1986, Steve Chamberlain and I collected a large number of pyrite cubes embedded in phyllite from a road construction site near Sherbrooke, Quebec. These pyrite crystals also have rims of quartz, white and fibrous. The rims are thick in some areas and thin or absent in others. All rims are found in the same position in a given specimen, regardless of the orientation of the pyrite crystals. That is to say, the location of the rims seems to be a feature of the rock and not of the pyrite crystals.  After some research, I learned that these rims are known to metamorphic petrologists as pressure shadows and that they are often seen in various metamorphic rocks associated with impervious objects that are larger than the grain of the rock.”

These specimens have been photographed under low light so the details of their highly striated surfaces can be better viewed.  They are exceptionally bright having lusters in check with the finest pyrite specimens from other parts of the world.  I have not seen any of the specimens for sale in a very long time and these are six of the best I have.  Six more will be listed in September 2014.  There are several boxes of other pieces in the $5 to $40 price range but these will only be offered at the few mineral shows I do including this year, 2014, at West Springfield, MA.

 

OKL-683   Pyrite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  This is the only loose crystal I will offer because it is exceptionally large ( 3.7 x 3 x 1.2 cm, edge measurements) and tabular, which is quite unusual for the find.  There is a small piece of attached matrix on one side and minor chipping but the specimen is in nice shape.  Unusual.  $50

 

 

 

 

 

OKL-684   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 9.3 x 4.5 x 4.2 cm with three cubes.  The largest cube is 2.2 cm on edge and spotless.  The other two cubes have one minor chip each.  Displays great.  Exceptionally fine specimen for the location.  $180

 

 

 

 

 

 

OKL-685   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 7.5 x 6 x 6 cm with one HUGE cube.  It is 2.5 cm on edge.  It has been reattached to the matrix and has a chipped area and corner along the back lower edge as seen in the photos.  It displays great from the front and well from the sides too but the back view shows the chipping.  If this was damage free it would have been the finest specimen collected by these guys!  I only need to get $130 

 

 

 

 

 

 

OKL-686   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix plate measuring 13.3 x 7.3 x 3 cm with six complete and undamaged crystals exposed on its surface!  This is the only specimen with this many nice undamaged crystals showing that was found.  Displays great.  $275

 

 

 

 

 

OKL-687   Pyrite in Phyllite    Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine light colored matrix plate measuring 6.9 x 5.5 x 3.2 cm with two complete and undamaged crystals exposed on its surface, one on the back and one on the front.  Crystals are about the same size reaching 1.2 cm on edge.  $70

 

 

 

 

 

 

OKL-688   Pyrite in Phyllite     RESERVED     Autoroute 10/55 Interchange Road Cuts, Sherbrooke TE, Estrie, Quebec, Canada. Ex. Dr. Steve Chamberlain Collection, circ. 1986.  A fine matrix piece measuring 6 x 4.2 x 2.8 cm with one very atypical cube.  Its shape is actually very un cube like and it measures 2.3 x 1.5 x 1.2 cm on its edges.  It had to be reattached to the matrix but is damage free and very showy.  Unusual and aesthetic.  $250

 

 

 

The Thomas G. Fowler Collection

 

Thomas Fowler, of Stamford Connecticut, was a mineral enthusiast, an avid outdoorsman throughout his lifetime (1943-2006), and the President of an internationally recognized design firm.  He was an active field collector of minerals and member of the Stamford Mineralogical Society during the 1960’s and 70’s.  His primary area of interest was in the minerals of South Africa of which he built a fine collection in both depth and breadth.  His Tsumeb suite numbered approximately 1,500 specimens, many of which are exemplary: dioptase, cerussite, and smithsonite are examples of

species of which he had many top pieces.

 

 

OKL-408

OKL-408     Willemite and Cerussite on Smithsonite     Berg Aukas Mine, Grootfontein, Otavi Mountain Land, Namibia, South West Africa.   Ex. Thomas G. Fowler collection.  This specimen measures 4 x 2.8 x 1.2 cm and is a floater with no damage.  It is a plate with a heavy coating of willemite sprays in acicular crystals on its front and clean tan colored smithsonites crystals with clear cerussite on its back.  Very attractive assemblage.  $325

 

 

 

 

 

 

OKL-443

OKL-443      Dioptase on Calcite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A damage free 4.5 x 3.5 x 3.2 cm miniature sized piece with a fully mineralized frontal face.  The bright, gemmy dioptase sit with clear calcites, also of exceptionally high luster.  A fantastic display of this rare material.  Sits perfectly.  This is a great one for those seeking perfect miniatures.  $380

 

 

 

 

 

OKL-366

OKL-366    Mottramite casts after Wulfenite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Mostly masses of crystallized mottramite of a high luster and deep green color, but amongst these mounds of material can be seen several casts of wulfenite crystals (encrustation pseudomorphs).  The entire piece is a fully crystallized cast and even the underside of the piece is crystallized (but not a thickly as the top.  The piece is for all effects a floater but there is one edge that shows a contact (or it is chipped?).  In either case the piece is in amazing shape and represents an aesthetic oddity for Tsumeb.  5.1 x 4.4 x 1.5 cm.  $425

 

 

 

 

 

OKL-367

OKL-367    Mottramite Stalactites     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A 4.2 x 3.4 x 2.7 cm grouping of nicely formed stalactites completely coated by mottramite.  No damage.  $195

 

 

 

 

 

OKL-368

OKL-368    Smithsonite on Dioptase and Brochantite included Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is quite the assemblage in a very aesthetic showing.  The calcites are quite clear but in most cases covered by smithsonite concealing the fact.  Included calcites can be seen on the edge of the piece and clearly show acicular brochantites of a vibrant blue color.  The dioptase are magnificent, as they usually are from this location and the overall variation in texture, color, and form is exciting.   No damage and only one edge contact which it stands nicely on.  4.4 x 3.2 x 2 cm.  The photos don’t do this piece justice as it is one of the most attractive miniatures in the collection.  $450

 

 

 

 

 

 

OKL-369

OKL-369    Brochantite and Unknown     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A 5.2 x 2 x 1.6 specimen with lots of acicular blue material in with an unknown species (tabular and clear).  $130

 

 

 

 

 

 

OKH-724

OKH-724    Calcite on Calcite Stalactites     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This one is odd showing large calcite rhombs almost entirely encasing smaller, dark brown stalactites of calcite.  The stalactites peek through here and there and most heavily on one side.  The specimen is domical showing well from the front, top and sides.  No damage, base and back contacts.  High luster on both generations of calcite.  9.4 x 8 x 5.5 cm.  $395

 

 

 

 

 

OKH-725

OKH-725    Anglesite? on Tennantite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  The images make this one look terrible but is actually very interesting.  In-hand you see nicely formed crystals that are transparent looking black in color due to the underlying matrix.  7 x 3 x 2.3 cm with crystals to 1.2 cm each.  My guess is that these are clear anglesite crystals based on their morphology.  No damage.  $250

 

 

 

 

 

OKH-726

OKH-726    Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A nice three dimentional mound of crystals measuring 3.6 x 2.5 x 2 cm.  Views nice from all sides, has edge contacts, flat base, and the usual high luster and sharply formed crystals.  $185

 

 

 

 

 

OKH-726

Back

OKH-726    Smithsonite casts after Unknown      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A large example showing smithsonite casts after a mineral of question.  The original coating of smithsonite on matrix (galena) is clear while the cast have a light pink color.  There are at least four places where casts are chipped but the specimen is unusual enough to still list here.  It displays well from front, top and sides with the base and majority of back showing no crystallization and being flat.  It sits nicely two different ways.  7.4 x 4.5 x 3.3 cm.  Very high luster.  Attractive and unusual color.  $350

 

 

 

 

 

OKH-728

OKH-728    Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is a very fine domical miniature with large crystals to 1.4 cm each.  The crystals are transparent and the piece views very well from any direction.  One crystal on back has a tiny tip ding that is not obvious.  The specimen measures 4.2 x 2.8 x 2 cm overall.  Great luster and form to all crystals.  Very nice!  $550

 

 

 

 

 

OKH-729

OKH-729      Cerussite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A beautiful “V” twin, uncommon for this mineral and location.  It is large, measuring in at 4.1 x 3.2 x 1.2 cm overall.  It has considerable chipping so is far from being undamaged however it is a Tsumeb rarity at someone might have interest in.  It is clear with milk colored veils on opposing wings of the twin (at depth).  The surfaces have nice luster and are heavily striated.  $500

 

 

 

 

 

OKH-730

Back

OKH-730    Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Another uncommon coloration for Tsumeb.  This plate of crystals measures 5.5 x 3.2 x 1.7 cm overall and is coated on its topside by sharply formed light brown crystal and on its backside with lighter and smaller tan colored crystals.  The piece has minor attachments along two small edges, otherwise a floater.  There appears to be a tiny chipped crystal near the center but even with magnification it looks clean.  I am pointing it out because the slight color difference could indicate that is cleaved.  A nice example that views fine from any direction.  $425

 

 

 

 

 

OKH-731

OKH-731      Cuprian Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Sharply formed schalenohedral crystals show up as coatings and in several radiating blooms on the surface of this 4 x 3.6 x 2.8 cm piece.  I beautiful shape with only edge contacts present.  No damage and great views all around.  The crystals are a vibrant green and of excellent luster.  We know how rare these cuprian smiths are and this one, although small is exceptional in quality.  $1,400

 

 

 

 

 

 

OKH-732

Back

OKH-732      Cuprian Smithsonite with Cerussite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This fine piece is one of the prizes of the collection and could be a centerpiece for any Tsumeb or smithsonite collection/ suite.  The entire upper surface and most edges are covered by large, transparent smithsonite crystals of a fantastic, rich green color.  On these can be see small blooms of cerussite crystals.  The backside of the specimen is coated by cerussite, partially well crystallized and partially massive.  The viewing surfaces on top are immaculate and have no damage.  It is slightly three dimensional with undulating mounds of the large (to .6 cm each) cuprian smithsonites.  This is NOT a druse of crystals.  Almost all are of this large size and they create a lot of flash.  The luster and form are both exceptional and consistent on every part of the surface.  8.7 x 6 x 3 cm. 

This fine specimen is for anyone who wants rarities but also searches for perfection.  The piece displays well from any direction and only shows minimal edge contact in a couple places.  Personally I have not seen any green smithsonite, for sale, this good from anywhere in the world.  Exceptional cabinet sized specimen.  Price on Request

 

 

 

 

 

OKH-733

OKH-733      Cobaltoan Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Another really impressive smithsonite in every regard… this has excellent color saturation but appears lighter in areas due to the transparency of the crystals and the black matrix.  I personally find these shade differences very attractive in that they present a variety of color contrasts over the surface of the piece instead of one consistent shade of color.  In any case, this large piece measures 7.7 x 6 x 3.5 and has crystals to 1.5 cm each.  The piece is more domical and three dimensional than it appears in the images and is robust feeling, in-hand, and views very well from any direction.  Even the edge contacts are clean showing little disturbance to the remaining crystal.  No damage, dull areas, low luster sections, or problems of any type.  Fantastic material!  $3,750

 

 

 

 

 

OKH-734

OKH-734      Cobaltoan Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This piece sits very high in a stable position showing complete crystallization on the front, one side and top.  There is partial coverage on the second side and back.  It measures 6.8 x 6 x 4.5 cm with individual crystals to a cm.  They are pink with light white phantoms and in good shape on all crystallized surfaces.  Base is flat and one edge has some contact in a very thin band.  The crystals are damage free except, of course, at areas of contact.  A handsome example.  $1,400

 

 

 

 

 

OKH-735

Back

OKH-735      Cerussite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Here is a cute little reticulated twin that has all the detail and appeal in a smaller package than the big, coveted, “snowflakes”.  This miniature measures 4.5 x 3.5 x 1.2 cm overall.  There is no damage and no contacts.  It is a floater.  It sits up on edge.  The backside is not as crisp and nicely geometric (it is slightly round) as the front.  The detail in this piece is amazing and impossible to capture in the images!!!  The luster is moderate, not exceptional but it not bad.  A fine example for those who like miniatures.   $850

 

 

 

 

 

 

OKH-736

OKH-736      Cerussite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A fantastic little sixling twin with good clarity and form.  It measures 4.1 x 2.3 x 2.7 and is fully formed on all sides.  There is no damage and the only contact is on the back/ base and it is small.  It views great form any direction and could be positioned for display in any manner as all the views are equally good.  The form and luster are very good too.  The crystal is highly striated not allowing one to get as good a perspective on the piece’s transparency.  Very nice.  $1,200

 

 

 

 

 

 

OKH-737

Proper color

OKH-737      Cerussite on Cadmian Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A fine miniature with a small, dark, twinned, .7 cm cerussite sitting amongst light yellow cadmian smithsonite crystals.  The piece is a thick plate measuring 5 x 4.6 x 2 cm.  The piece sits nicely on edge or just flat.  There is no damage.  The individual crystals are to .8 cm on edge and tightly intergrown.  $900

 

 

 

 

 

OKL-632

OKL-632      Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive piece with lots of contrast between the small crystals of smithsonite, large crystals (to 1.5 cm each), and the dark matrix.  The specimen measures 6.2 x 5.5 x 4 cm overall and the large crystals stand up very high off the matrix.  One crystal in one cluster, low and to the right, directly on the edge of the specimen, is chipped as should be expected but everything else is free of damage.  The grouping stands and displays nicely.  A fine example of crystallized smithsonite.    $450

 

 

 

 

 

OKL-633

Worst side with breakage

OKL-633      Cerussite on Mottramite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Big twinned crystals of transparent cerussite to 2.5 cm eah sit up high on a rich green matrix coated by mottramite.  The frontal view is fantastic but there is side damage that may be distracting to some.  7.1 x 4 x 3.9 cm.  Very transparent for the species.  Selective coatings by light green duftite on a few crystal faces.  $450

 

 

 

 

 

OKL-634

Back

OKL-634      Cerussite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This one is a fine single crystal with a smoky tint measuring 4.7 x 3.5 x 3.5 cm overall.  It sits on the matrix contact and is damage free on its viewable surfaces.  Red inclusions of unknown material on right side of specimen in frontal view.  A very high quality miniature.  $400

 

 

 

 

 

OKL-636

OKL-636      Cerussite and Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Large parallel growth crystals (this could just as easily be described as one crystal with sections of matrix separating various segments of its body) of slightly milky cerussite make up this 4.9 x 4.5 x 3.5 cm grouping.  Contacts are minimal and on back.  Very minor chipping on one crystal on one edge.  The overall condition is very nice.  $380

 

 

 

 

 

OKL-637

Back

Cerussites and unknown

Largest cerussite

OKL-637      Cerussite on Smithsonite with Unknown    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A small plate measuring 4.5 x 3.2 x 1.3 cm with its largest cerussite crystal measuring 1.2 cm on edge.  Red mineral in small crystals which look to be dodecahedrons is unidentifiable to me.  No damage.  A sweet piece for this price… $295

 

 

 

 

 

OKL-638

OKL-638      Cerussite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An exceptional large, transparent and beautifully formed twinned crystal of cerussite measuring 4 x 3.8 x 3.3 with moderate amounts of green mottramite as a matrix.  This specimen is outstanding in all the important ways…high luster, contrasting surface textures for the twin, contrasting colors for the species, excellent clarity, sharp and complex form… one side has a healed contact.  No damage.  Sits nicely a couple of ways and has fantastic views.  Very high quality for this once common material.   $800

 

 

 

 

 

 

OKL-639

OKL-639      Cuprian Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Close inspection shows lots of spike balls of this rare green colored smithsonite coating the display face of a 4 x 2.2 x 1.6 cm piece.  Stands on edge for display.  No damage and moderate edge contacts.  A rare crystallized smithsonite from the classic locality for this material.     $600

 

 

 

 

 

OKL-641

OKL-641      Cerussite on Mottramite with Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is primarily blades and twins of cerussite to 1.7 cm each scattered about on the surface of green mottramite.  There is a frosting of what appears to be clear smithsonite (maybe dolomite) in some areas producing a “sugary” texture.  Very good quality with no damage and contacts being isolated to the base and back.  Minor Styrofoam attached on base.  6.2 x 5.2 x 4 cm.  Superior clarity, form and visual appeal to these fine crystals.   $2,500

 

 

 

 

 

 

OKL-642

Side showing most damage

OKL-642      Cerussite on Mottramite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This big, impressive specimen has issues but is still worthy of some effort on someone’s part.  Strong edge contact with damage and two dings on the big crystals are distracting.  However, it is one of those specimens that could be trimmed and doctored in order to produce a fine cabinet specimen of high quality.  11 x 7.5 x 5 cm.  First $1,000 takes it.

 

 

 

 

 

 

OKL-643

Largest twin

Highly frosted side (base)

OKL-643      Cerussite on Mottramite with Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is primarily blades and twins of cerussite to 2.7 cm each scattered about on the surface of green mottramite.  There is a frosting of what appears to be clear smithsonite (maybe dolomite) in some areas producing a “sugary” texture.  One missing crystal and some minor chips but they are minor with only one edge showing contact. Most views are attractive and damage free.  Entire specimen is mineralized showing varying degrees of luster.  11.2 x 8 x 7 cm.  A very different looking example.  $2,100

 

 

 

 

 

OKL-644

Back

OKL-644      Cerussite on Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Nice large cerussite twins to 3+ cm in diameter on matrix coated by smithsonite crystals.  There is chipping  present and one large crystal shows breakage.  7.8 x 5 x 4 cm.  $325

 

June 2014 Update, Page 2

 

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