May 2014 Update, Page 3

 

 

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-620

OKL-620      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This matrix specimen measures 4.2 x 3.8 x 3 cm and has both smaller primary crystals coating the matrix as well as nicely formed, large smithsonite crystals to 1 cm each studded about on its surface.  The large crystals stand up nicely, are translucent and damage free. Some minor edge contact otherwise the specimen has good damage free crystallization both front and back.  A fine miniature. Minor Styrofoam attached on backside.   $360

 

 

 

 

 

 

OKL-621

OKL-621      Cerussite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A large twinned cerussite crystal rests within a forest green micro crystalline coating (probably mottramite) matrix.  The cerussite is damage free and measures 3+ cm in diameter.  There are lots of matrix attachment marks appearing ivory colored.  This material obviously formed in close confines.  The piece measures 5.5 x 3.1 x 3 cm overall.  The cerussite is exceptionally lustrous and transparent for the species and locality.  It has a slight smoky cast.  $275

 

 

 

 

 

 

 

OKL-623

Back (worst view)

OKL-623      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive dome of crystals measuring 4.5 x 3.7 x 2.6 cm overall with individual crystals to 1.2 cm each.  The crystals have an attractive satin luster, somewhat honey colored cores.  There is base contact and very minor back contact with no damage being present elsewhere.  The piece displays great from all the usual directions: front, sides, and top.  $375

 

 

 

 

 

OKL-624

Back

OKL-624      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A fine miniature with big crystals to 1.4 cm each.  It sits well and is damage free presenting attractive views from all sides.  In total the piece measures 3.8 x 3.1 x 2.6 cm.  There is minor Styrofoam attached to base.   $250

 

 

 

 

 

OKL-625

OKL-625      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection. Seeing a Tsumeb smithsonite in botryoidal form is a bit unusual since we are so spoiled by the great crystals produced at this classic locality.  Well, here it is, a short stalactite of an unusual greenish tan color measuring 4 x 3 x 2.4 cm.  The tip is damaged but otherwise in nice condition.  Stands nicely for display.    $160

 

 

 

 

 

OKL-626

OKL-626      Mimetite and Unknown    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Single and double terminated mimetite crystals to 1 cm each are dispersed within, sometimes coated by whatever this purple mineral is.  Heavily encrusted on both sides.  Stacked all over creating a very three dimensional look.  Edge contacts on several sides but no damage to the display sides.  9.6 x 4.7 x 4.5.  Stalactitic and drapery like forms on both sides.  Different.  $150

 

 

 

 

 

OKL-627

Back

Front

OKL-627      Mimetite and Unknown    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A more typical looking Tsumeb mimetite specimen with lots of medium yellow, sharply terminated, translucent crystals to close to 1 cm maximum length.  Close inspection with magnification will find a couple tiny clipped off crystals among the many hundreds present, but only a couple.  All surfaces are coated and it sits on edge displaying well from any direction.  Other minerals are????  $220

 

 

 

 

 

OKL-628

OKL-628      Cuprian Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive green colored smithsonite in tiny crystals shows up dramatically on this bright white crystallized matrix.  Three dimensional in form, colorful, nice luster, no damage, good views front, top sides.  4.3 x 3.4 x 2.8 cm overall.  Rare color.  Excellent miniature in all regards.  $400

 

 

 

 

 

OKL-629

OKL-629      Cobaltoan Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Vivid pink crystals fill a “V” shaped void in this matrix specimen.  It measures 4.7 x 4 x 2.8 cm with transparent crystals to .6 cm each.  No damage.  $180

 

 

 

 

 

OKL-630

OKL-630      Dioptase on Calcite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Beautiful green crystals of good translucence to transparency on clean white calcite crystals… the dioptase crystals are to .7 cm each and the piece measures 4 x 3.5 x 2.8 cm.  Fantastic miniature!  $325

 

 

 

 

 

OKL-631

Back

OKL-631      Calcite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   The most recognizable form from Tsumeb, these translucent to transparent bladed crystals show the classic stepped form and the normal light tan coloration.  This piece is fully formed on all sides except where the is a small base attachment.  It is damage free and measures 5.5 x 3 x 2.2 cm overall.  It is attractive and very reasonably priced.     $30

 

 

 

 

 

OKL-645

Back

OKL-645      Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Very sharply formed rhombs of an unusual brown colored smithsonite coat all of one side of this specimen and some small regions of its backside.  Close inspection will show tiny botryoidal groups of a green mineral that appears to be malachite in many areas of the display face.   The crystals are to .7 cm each and the specimen measures 6.3 x 4.8 x 2.1 cm.  The plate is basically a floater with only the smallest of contacts on back.  No damage at all.  Very fine piece.  $700

 

 

 

 

 

OKL-646

OKL-646      Cobaltoan Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A very fine, large specimen measuring 9.2 x 6.7 x 4 cm overall with large crystals to 1.6 cm each.  The luster is fantastic and the contrast with the black matrix really sets off the color in these crystals which are an attractive pink/ purple color.  They are transparent to translucent and often have color variations within each crystal.  The white regions appear to be low lying cerussite some of which shows chipping.  This is minor as the entire piece is otherwise pristine.  Even the edges are very nice in quality not showing the typical breakage from matrix.  The piece displays best on edge but will not sit this way without aid.  A spectacular example of what some of the fines of these classic smithsonite crystal groups looks like.  I feel this price is a great one and anyone looking for a killer Tsumeb smithsonite should consider its acquisition.    $1,750

 

 

 

 

 

OKL-647

Cuprite in base

OKL-647      Smithsonite on what appears to be Cuprite casts after ?   Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection. The label simply stated “Smithsonite, Tsumeb, S. Africa”.  If someone told me that this was Berg Aukas, Grootfontein Dist., Namibia I’d be hard pressed to argue differently… except that cuprite is unknown from there.  This specimen appears to clearly have bright red cuprite below the smithsonite crystals and they even appear to be casts after some prismatic, bladed species that is now long gone.  A strange specimen for sure.  I’m left trusting the label and describing it as follows:  the crystals a a light yellow color with an interesting stepped surface growth, giving them an etched appearance.  They are quite large, to 1.6 cm each, and they coat these bright red casts of what appears to be cuprite.  A tiny cleave off one crystal on the end is all I can make out for damage so the specimen is in excellent condition, overall.  Some minor Styrofoam is attached to the base.  It displays nicely from any direction.  7.9 x 6 x 4 cm overall.  An attractive and unusual find from this prolific mine.  $650

 

 

 

 

 

OKL-648

OKL-648      Calcite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A very unusual calcite with stalactites formed from nice rhombic crystals all over the display face which is coated by clear to white primary, or first generation rhombs.  The stalactites are small with lots of hematite inclusions, coatings, and phantoms.  Very attractive display and of the highest luster one could expect for the species.  A couple stalactites can be seen to show damage but for the most part this specimen is in nice condition and displays great.  7.5 x 6 x 5 cm overall.  Minor green duftite.  $300

 

 

 

 

 

OKL-649

Back

OKL-649      Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Large transparent to translucent crystals reaching 1.2 cm each in numerous regions of this fine matrix piece.  Coatings of small, large or a combination of both sizes of crystals on all sides.  Sits a couple of different ways displaying nicely from all views.  Contact edge is the base and one side shows some contact but the crystals are in fantastic condition.  7.2 x 6 x 4 cm.  Attractive and desirable.  $425

 

 

 

 

 

OKL-650

OKL-650      Smithsonite    Tsumeb Mine, (more likely Berg Aukus) Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection. A large, crude, translucent mass of botryoidal material.  Rare color and uncommon form measuring 6.7 x 5 x 4.7 cm.  Very rough from breakage along one side and base.   $320

 

 

 

 

 

OKL-651

OKL-651      Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Attractive light pink smithsonite crystals on a matrix that measures 5.2 x 3.5 x 2.8 cm overall.  The crystals are up to .9 cm each and have a lower luster due to a light frosting and an accessory mineral (unknown white coating) that is evident in the images. No damage.   $150

 

 

 

 

 

OKL-652

OKL-652      Cuprian Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Crystals of this rare green variety are so uncommon, and fine examples like this, simply a rare thing on today’s market.  This high luster example is composed of stacks of transparent light green crystals to .6 cm each.  Their surfaces show an unusual rhombic patterning on their surfaces that I have not seen in this material.  All surfaces except the base and the lower part of one side are fully crystallized and aesthetic.  This is a very attractive miniature that measures 4.5 x 4.5 x 2.5 cm.  It stands on edge and views great from any direction.  I think it is damage free but when looped there is one area on side/ back that could show crystal contact.  It is really hard to tell.  I think this is about as fine a miniature as you could find of this rare stuff.  $1,200

 

 

 

 

 

OKL-653

OKL-653      Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Very large (to 2.4 cm) crystals forming a short stalactite.  Good condition but I see a thin cleave off the edge of one crystal, which could be considered the back as it views nicely from any direction.  Nice translucence.  Etched appearance to crystal surfaces.  4.3 x 3.1 x 3 cm overall.  Minor Styrofoam on base.  $350

 

 

 

 

 

OKL-654

Back

Close-up on cerussite crystal, mostly covered.

OKL-654     Cuprian Smithsonite, Cerussite, Calcite, Duftite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A really attractive light greenish blue specimen (the smithsonite).  Mix includes calcite and duftite  Edge contacts but no damage to central regions.  A cerussite twin can be seen in the bottom center of the display face but it is partially buried by other species.  Some crystallization on back.  Sits nicely.  Very attractive miniature measuring 5.4 x 4 x 3 cm.  $300

 

 

 

 

 

OKL-655

Back

OKL-655      Cobaltoan Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A nice miniature with unusual barrel shaped crystals of a purplish pink color on a dark matrix of crystallized tennantite.  The smithsonites and matrix are damage free and the only contact is its flat base.  It sits nicely and views well from all directions.  5 x 2.5 x 2.1 cm.  Excellent miniature.  $650

 

 

 

 

 

OKL-656

Back/ base

OKL-656      Cobaltoan Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A very bright pink example with transparent crystals to 1 cm each coating all sides except base.  Only damage is a single crystal cleave on the top back that does no show from the frontal view anyway.  This is an exceptionally aesthetic miniature for color, luster and clarity.  4.7 x 3 x 2.4 cm.  Great piece!  $750

 

 

 

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OKG-114

OKG-114    Quartz Stalactite Vug     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  12.3 x 9 x 4.5 cm with individual stalactites to 6 cm each.  This is a really interesting piece with numerous jackstraw stalactites in a partial vug.  The thin stalactites are coated by a lustrous druse of quartz and is flashier than the images indicate.  Sawn flat base so this is not a big rock, it is a well trimmed display specimen.  Minor hematite blades.  In good condition with only two small stalactite ends being broken free from matrix.  This is another one of those "one of a kind" specimens from this interesting find.  Unique.  $275

 

 

 

 

 

 

OKJ-967

OKJ-967    Quartz and Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  7 x 6.1 x 4.4 cm with quartz points to 2.8 cm each.  A beautiful, damage free, aesthetic example of nicely formed single and double terminated quartz crystals with fine calcites.  Great luster and clarity to the quartz and minor hematite for contrast.  A very respectable example for a reasonable price.   $125

 

 

 

 

 

 

 

OKJ-968

OKJ-968    Quartz and Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   1.7 x 7 x 3.5 cm overall with quartz points to 2.2 cm.  This fine example is damage free and typical of this interesting find.  The quartz is alpine quality and the hematite and calcites are nice contrasts.  $90

 

 

 

 

 

 

OKJ-969

OKJ-969    Quartz and Calcite   Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut. 9.6 x 5.5 x 4 cm with quartz crystals to 2 cm each.  Another fine, lustrous, damage free example.  Minor goethite replacing chalcopyrites as inclusions and in between quartz points.  Very flashy stuff.   $120

 

 

 

 

 

 

 

OKJ-970

Back

OKJ-970    Quartz cast after Anhydrite with Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   7.1 x 5.1 x approximately a cm thick. Another large, damage free example of these important pseudomorphs.  Complete crystal coverage, including nice double terminated calcites, on one side and a completely open view of the internal replacement surface on the other.  Again, problem free examples of this material are rare due to quarry blasting.   $165

 

 

 

 

 

 

 

OKG-081

OKG-081    Quartz, alcite and Hematite with psudos after Chalcopyrite?     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut. 10.9 x 7 x 3.5 cm with calcites to 2.6 cm.  Another odd and very rare specimen from the find of which I've only seen a couple.  The calcites are dog tooth and reached a point in their growth when quartz crystal and hematite coated everything.  Next there was continued calcite development but it did not cover all crystal faced on the large calcites.  What remains is selective face coverage of lustrous quartz in well developed single and double terminated calcites.  One calcite has a small internal burse which can be seen in the images.  We all know this can be hid by oil but that's not for me to do, that is up to the new owner.  I can't see how this would not be scooped up quickly by anyone interested in East Coast materials.  How often can you get an attractive, interesting, unique, cabinet sized calcite for this price?  $290

 

 

 

 

 

 

 

OKJ-971

OKJ-971    Quartz and Calcite with Goethite pseudos after Chalcopyrite    Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  9 x 5.5 x 3.3 cm overall with quartz crystals to 2.3 cm and calcites to 2 cm each.  An attractive plate of crystals with lots of luster, contrast in colors, contrast in form, and with nice damage free crystallization.   $160

 

 

 

 

 

 

 

OKJ972

OKK-754    Quartz and Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  5.1 x 4.8 x 3 cm overall with quartz points to 2 cm.   This is among the finest, damage free, aesthetic miniatures of this material I've noticed from the find.  The burst of quartz crystals is girdled by calcites, the matrix, in perfect proportion.  Crystallized by quartz druse on backside.  A very fine example in every regard.  $175

 

 

 

 

 

 

 

OKJ-973

OKJ-973    Quartz cast after Apophyllite with Calcite    Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  8 x 5.2 x 3.5.  The largest pseudomorph measures 3 cm wide.  Another unique specimen of which I have seen no other examples!  Not as highly aesthetic as most of the material from this material so it has a very attractive price for a unique mineral specimen.  A little calcite on bottom edge is gone but otherwise damage free.  An important specimen to someone... keep in mind this find appears to be exhausted.  $120

 

 

 

 

 

 

 

OKJ-974

Back

OKJ-974    Quartz cast after Anhydrite with Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  6 x 3.4 x 1.2 cm.  The largest calcite measures 2 cm long. A nice example of these casts with only a small tip chip, otherwise complete and damage free.  Beautifully formed, double terminated calcite with good luster and translucence.   $95

 

 

 

 

 

 

 

OKJ-975

OKJ-975    Quartz and Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  72 x 5.5 x 2 cm with quartz crystals to 2.1 cm.  A fine, damage free example of this aesthetic material.  No issues except positive ones.  Like most of these specimens this is also better in hand.  $95

 

 

 

 

 

 

 

OKJ-976

OKK-754    Quartz and Calcite with Chalcopyrite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  6.2 x 4.5 x 2. cm with quartz crystals to 1.5 cm.  A cute, specimen with the typical look.  A rather large chalcopyrite replaced by goethite.  It is chipped on the backside... no other damage.   $45

 

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