September 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.  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-689   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 6.8 x 6 x 3.3 cm with two, sharp, undamaged cubes to 1.3 cm on edge.  Sits nicely… showy.  $95

 

 

 

 

 

OKL-691   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 5.8 x 5.8 cm with an uncommonly large cube measuring 2.2 cm on edge.  It is well positioned and sits upright for display.  One back edge has some chipping and another very minor rubbing but front and side views are very nice.  $175.  

 

 

 

 

 

 

OKL-692   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 x 5.5 x 4.2 cm with one nice undamaged cube measuring 1.4 cm on edge. An excellent example that displays well at least two different ways.    $70

 

 

 

 

 

 

OKL-693   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 5.7 x 4.5 x 3.4 cm with a beautiful, undamaged single cube that is 1.3 cm on edge.  Displays on edge with cube sitting up nicely.  $75

 

 

 

 

 

 

OKL-694   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 6.7 x 4.5 x 4.2 cm with a single undamaged cube measuring 1.6 cm $95

 

 

 

 

 

 

OKL-695   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 x 5.7 x 4.2 cm with a single perfect cube (zero damage) 1.7 cm on edge.  Displays great!  $90

 

 

 

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-396

OKL-396    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A seam filled by nice bright crystals to .7 cm each.  Measures 5.9 x 3.7 x 2.4 cm.  Edge contacts are broken crystals.  $200

 

 

 

 

 

 

 

OKL-397

OKL-397    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A 6.1 x 4 x 2.5 cm specimen with nice crystals and damaged crystals too.  Priced accordingly.  $175

 

 

 

 

 

 

 

OKL-395

OKL-395    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This 5 x 4 x 4 cm piece has bright crystals to 1 cm each in a single small grouping on the top center.  These are on calcite and several edge crystals in the group are damaged as can be seen.  Still a specimen that may fit into someone’s collection and price range.  $120

 

 

 

 

 

 

 

OKL-394

OKL-394    Dioptase, Smithsonite, Calcite, and Duftite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This 5.2 x 4.5 x 3.5 cm specimen with crystals to .9 cm each.  The matrix is composed of crystallized smithsonite with tiny rhombs of clear calcite on it.  This was followed by minor duftite and the beautiful dioptase crystals.  One side of the specimen shows some damage but the remaining areas are very clean and aesthetic.  $500

 

 

 

 

 

 

 

 

OKL-393

OKL-393    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A 7.2 x 5.2 x 3.5 cm specimen having crystals to almost 1 cm each.  Minor wulfenite mixed in with the duftite.  Damage on edge of opening due to removal from rock as would be expected.  Very nice.  $450

 

 

 

 

 

 

 

 

OKL-392

OKL-392    Dioptase and Duftite on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  There are several mounds of calcite coated by dioptase forming this piece with minor duftite showing mostly along its perimeter.  The large specimen measures 8 x 7.2 x 5 cm.  This one sits beautifully and is quite attractive.  Most of the crystals have a slightly stepped appearance to their surfaces.  I can see no damage even on high points with magnification.  Fantastic example.  $950

 

 

 

 

 

 

 

OKL-390

OKL-390    Dioptase with Cerussite and Smithsonite??      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is an outstanding display specimen of rich color with thick coverage of dioptase on its display surfaces.  It is very three dimensional and partially crystallized on the back.  One side is just dioptase with some minor cerussite peaking through and the other has some coatings of what appears to be a light green smithsonite druse.  8.5 x 5 x 4 cm.  Only edges show the typical breakage from removal with the primary crystalline areas being damage free.  A great example of this uncommon and desirable material.   $1,800

 

 

 

 

 

 

 

OKL-389

OKL-389    Dioptase on Calcite with Duftite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This attractive specimen dioptase and duftite in green (totally different shades!) on white calcite.  The specimen measures 6 x 4 x 4.4 cm.  All crystals other than the calcites are small and dispersed over the entire specimen.  It domical and views well a couple of different ways.  The dioptase crystals are gemmy.  Damage free and very aesthetic.   $280

 

 

 

 

 

 

 

OKL-388

OKL-388    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This 7 x 4.4 x 2.3 cm specimen has one hollow area filled by bright green crystals to over 1 cm each.  They are on white calcite.  There is damage to the edge crystals and others so is priced accordingly.   $140

 

 

 

 

 

 

 

OKL-387

OKL-387    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  6.4 x 4.3 x 3.2 cm specimen with a druse of small crystal on white calcite rhombs.  The crystals are small but exceptionally bright and gemmy.  They make for a fine contrast and an excellent display piece which sits and views well.  Minor coverage on one side as well as primary display face.   $390

 

 

 

 

 

 

 

OKL-386

OKL-386    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   A 6.4 x 4.5 x 3.8 cm specimen entirely coated on its display face by nice transparent to translucent, high luster crystals to .6 cm each.  There are two high spots with a few missing crystals but overall this remains a very attractive and desirable piece.  Well spaced crystals of the highest quality on a contrasting crystallized matrix. $475

 

 

 

 

 

 

 

OKL-385

OKL-385    Dioptase on Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  7 x 4.7 x 4 cm specimen with a druse of small crystal on white calcite rhombs.  The crystals are small but exceptionally bright and gemmy.  They make for a fine contrast and an excellent display piece which sits and views well.   $390

 

 

 

 

 

 

 

 

OKH-752

OKH-752     Cobaltoan Smithsonite        Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   The finest miniature in the collection given the massive size of the dominate crystal.  It alone measures 3 x 2.9 cm and is a luscious pink color.  It is transparent to some depth then crosses over to being translucent.  The overall dimensions of the specimen are 7 x 5.2 x 3.8 cm.  It sits a couple different ways on flat surfaces showing the crystals equally well.  One tiny crystal beside the big one must have grown across the pocket because it shows a small contact with rock.  No damage but has strong edge contacts.  Great satin luster!  An exceptional smithsonite.  Price on Request

 

 

 

 

 

 

 

OKL-429

Back

OKL-429      Smithsonite casts after Unknown     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  These casts are most likely after calcite given their nice rhombohedral shape, but I guess it could as easily be after some other carbonate species.  5.5 x 4.7 x 3 cm overall with well formed casts to 2 cm.  No damage and interesting form.  Pink smithsonite replacement on top sides white to greenish white on bottom.  Fully formed (crystallized) on all surfaces less one small contact area on base, or if you prefer, back.  The piece is exceptional in every regard and certainly a rare thing.  Views from any direction, not too fragile to handle…perfection.  Beautiful and unusual.  $3,900

 

 

 

 

 

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

 

 

 

 

 

 

OKH-751

OKH-751     Calcite and Mottramite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Large clear calcites on rock surface coated, in part, by mottramite.  Two large crystals are cleaved while others are good.  9 x 7 x 4 cm with crystals to well over 2 cm each.  $30

 

 

 

 

 

 

 

OKH-750

OKH-750     Calcite and Duftite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An unusual example heavily included with what could be duftaite or maybe mottramite.  It is a nice hand specimen measuring in at 8.8 x 5.3 x 3.5 cm.  It is crystallized on all surface less a couple small areas of edge contact.  There are several small runs on crystals but all are minor and rather inconspicuous.  All views are fantastic including the back and all surfaces have fine luster.  The inclusions of green duftite are limited to the front of the specimen.  The upper surface/ front is very three dimensional.  $240

 

 

 

 

 

 

 

OKH-749

Back?

Front?

OKH-749     Calcite and Mottramite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive piece for color contrast and crystal arrangement.  The calcites are very strange being in a form I do not recognize.  Often the larger crystals appear to be in parallel growth.  The specimen measures 7.1 x 6 x 3.1 cm and is crystallized front and back.  Edge contacts and one crystal cleaved on back.  $165

 

 

 

 

 

 

 

OKH-748

Bottom

OKH-748     Cuprian Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This pretty apple green color is so attractive in smithsonite and sadly so rare.  The specimen seen here is a fantastic dome shaped piece entirely coated on its upper surfaces by a druse of green crystals.  The backside (base?) has similar crystals but they more thinly scattered giving you a look at their appearance as individuals.  They are small, only reaching a few millimeters each, but they are very high in luster, nice in their form and totally damage free.  The piece could be positioned several different ways, all of which give beautiful views of damage free surfaces of intense color.  6.9 x 5.5 x 3 cm.  Impressive.  $8,500

 

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