April 2014 Update

 

 

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.

 

 

OKH-493

OKH-493      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection, circ. 1970s.  This closed manganese mine once owned by Assoc. Manganese Mines of South Africa, Ltd. has produced what many consider to be the finest rhodochrosite specimens ever found.  Due to their rarity they remain one of the most difficult collectable mineral specimens to find in quality pieces.  We have available a limited quantity of these rare rhodos due to the recent acquisition of the Thomas G. Fowler collection.  The ones listed here show limited or no damage (very rare for this material) and range from a very dark reddish pink to a rich, bright red.  All specimens have spectacular luster and intense color saturation, no matter what their color. 

This nice three dimensional grouping of crystals measures 3.8 x 3 x 1.4 cm.  The crystals are a vibrant red color and in the classic schalenohedral crystal form.  With the microscope I can make out one small crushed crystal right near one edge (appearing as white area) but overall the specimen is in very nice condition.  Keep in mind I am not backlighting these specimens or changing their color with any computer wizardry.  They are as one would expect the finest of this famous material to appear, in-hand.  It balances on edge for display but is not as stable as one would like.  A very nice piece  $2,900

 

 

 

 

 

 

 

OKH-494

OKH-494      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection, circ. 1970s.  This closed manganese mine once owned by Assoc. Manganese Mines of South Africa, Ltd. has produced what many consider to be the finest rhodochrosite specimens ever found.  Due to their rarity they remain one of the most difficult collectable mineral specimens to find in quality pieces.  We have available a limited quantity of these rare rhodos due to the recent acquisition of the Thomas G. Fowler collection.  The ones listed here show limited or no damage (very rare for this material) and range from a very dark reddish pink to a rich, bright red.  All specimens have spectacular luster and intense color saturation, no matter what their color. 

A wonderful specimen although it is not the classic deep red color and schalenohedral crystal form.  This miniature is a vibrant, intense cranberry (deep pinkish red?) and has pinacoid terminations and stepped growth leading to these terminations.  It measures 3.9 x 3.8 x 1.8 cm and has no damage, less edge contacts.  A couple dozen crystals compose the piece.  This is a great example, again in an uncommon form.  Keep in mind I am not backlighting these specimens or changing their color with any computer wizardry.  They are as one would expect the finest of this famous material to appear, in-hand.  $3,600

 

 

 

 

 

 

OKH-495

OKH-495      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection, circ. 1970s.  This closed manganese mine once owned by Assoc. Manganese Mines of South Africa, Ltd. has produced what many consider to be the finest rhodochrosite specimens ever found.  Due to their rarity they remain one of the most difficult collectable mineral specimens to find in quality pieces.  We have available a limited quantity of these rare rhodos due to the recent acquisition of the Thomas G. Fowler collection.  The ones listed here show limited or no damage (very rare for this material) and range from a very dark reddish pink to a rich, bright red.  All specimens have spectacular luster and intense color saturation, no matter what their color. 

This thumbnail sized group of several crystals measures 2.2 x 1.2 x 1 cm.  The crystals are a vibrant red color with schalenohedral form, magnificent transparency, and tiny bladed inclusions of manganite at their bases.  No damage.  Keep in mind I am not backlighting these specimens or changing their color with any computer wizardry.  They are as one would expect the finest of this famous material to appear, in-hand.  A fantastic TN sized specimen of large crystals  $900

 

 

 

 

 

OKL-338

OKL-338      Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  It would appear that there are three generations of smithsonites here:  small prismatic crystal of a very light pink to clear color, next larger, to 1 cm each, sharp rhombs of a tan color and finally, in some places a tan colored to pink druse on the previous generations.  The dark colored matrix makes for a nice contrast.  I detect no damage and only base contact.  Fully crystallized on all surfaces other than the thin base contact.  $395

 

 

 

 

 

 

 

OKL-339

Inside

Outside

OKL-339      Smithsonite (cast?)      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is one of my favorite specimens from the collection!  The crystals of clear to slightly tan colored smithsonites are exceedingly sharp in their form and transparent/ translucent at their cores.  The entire piece looks to have been a cast growing on some other large crystal but that is difficult to prove in that every surface is now crystallized.  There are only to very small places where there was edge contact and the piece basically displays as a damage free floater.  The luster is exceptional and the crystals are large, to 1.9 cm each, with many being of large size.  The specimen measures 7 x 5.6 x 3.5 cm overall but appears larger in hand.  It is very sculptural and three dimensional.  The inside of the piece has a clearer, cleaner look while the crystals on the outside have a greater degree of tint, slightly tan, to them.  An exceptional smithsonites from the classic smithsonite locality.   $3,600

 

 

 

 

 

 

OKL-340

Back or bottom

OKL-340      Cerussite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive reticulated specimen measuring 6.8 x 4 x 2.5 cm.  It has a smoky color with the thinnest blades of the twin appearing clear.  The transparency is excellent and condition is nice with only a very small edge of a blade on each end having a chip (very minimal damage for such a fragile specimen).  All surfaces are crystallized including the base but it is more crude in form.  Sits well and is much better in-hand than the photographs indicate.  $3,300

 

 

 

 

 

 

 

OKL-342

OKL-342      Wulfenite, Smithsonite, Mottramite, etc.       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A nice variety of species and colors compose this lustrous 4 x 2.9 x 2.2 cm miniature.  It is crystallized on all sits.  There is considerable damage, so there is considerable discount.  $30

 

 

 

 

 

 

 

 

 

OKL-343

This view shows scrape near base.

OKL-343      Cadmian Smithsonite Stalactite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A beautiful miniature sized stalactite completely coated (less one tiny area on the backside) by tan colored smithsonites.  One scraped area in lower 1/5th of piece visible in the first pic.  All upper regions beautifully lustrous and damage free.  The yellow/ brown varieties of this mineral are rare and Tsumeb is the one world wide locality most noted for them.  $800

 

 

 

 

 

 

 

 

OKL-344

OKL-344     Cobaltoan Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This fine miniature is a plate of crystal to 1.6 cm each, beautifully saturated with a deep pink color.  It measures 5.2 x 3.1 x 1 cm overall and has no damage.  Surfaces are transparent and at depth the crystals are translucent.  Bright and attractive with that typical smithsonites, satin luster.  $2,300

 

 

 

 

 

 

 

OKL-345

Large transparent crystals

OKL-345      Cuprian Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   A fine green smithsonite in what again appears to be three generations of growth.  First, a green druse of cuprian smithsonites representative of most all of this rare material… next larger cuprian crystals to .7 cm (very large for this color), and finally in a couple places on the large smithsonites there are druses of white smithsonites.  It is only the front of the piece that is mineralized.  The specimen measures 5.8 x 4 x 2. 5 cm.  No damage.  Rare stuff.  $2,800

 

 

 

 

 

 

 

OKL-346

OKL-346      Smithsonite       RESERVED      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A large piece of matrix coated by light rose colored smithsonites crystals (cobaltan?) of uncommon form.  They are not the typical rhombs.  They are small crystals with a more prismatic and stepped growth form.  The piece is damage free less a small area on the lower right side.  This breakage shows the specimen to actually be mounds created by casts after a rectangular and prismatic mineral species now gone (possibly anhydrite).  This piece is more three dimensional than it appears and the luster is very nice.  8.3 x 6 x 3.2 cm overall.  $1,400

 

 

 

 

 

 

 

OKL-347

None of these images show the true, light pink, coloration present in this specimen.

OKL-347       Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This example is another unusual one being composed of prismatic single and double terminated crystals on a dark matrix.  The color is actually a very attractive light pink and their luster is exceptionally bright for smithsonites.  The photos do not due these features justice.  In places there is either a secondary growth of clear smithsonites crystals or small cerussites.  They are so tiny I can’t even tell under 10x magnification.  6.4 x 4 x 2.5 cm.  The coverage by crystals includes the full front, about half the back, the top, and all of one side.  Bare are the base, one side and some of the back.  No damage, sits great… flashy in-hand.  It had a poor photograph session here.  $1,700

 

 

 

 

 

 

 

OKL-348

Proper color.

Inside

OKL-348    Dolomite cast after Unknown     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This dome of dolomite is bright white and very lustrous (for dolomite!).  It measures 7.1 x 6.4 x 2.3 cm and shows blades molds on the bottom side.  Very clean with no staining or damage of any kind.  $350

 

 

 

 

 

 

 

OKL-349

OKL-349    Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  I think there were only two specimens like this in the collection, the other being less important and smaller, having smithsonites crystals with such pronounced phantoms.  Two generations of smithsonite are seen with the first being prismatic crystals of a pink to white color, transparent and small.  The second are larger, to .7 cm with bright yellow/tan colored phantoms.  The piece measures 7.1 x 5.2 x 3.2 cm overall.  It is visually aesthetic and stands on edge.  There is no damage and only minor matrix contact along one edge.  It views from any direction and is different from all directions.  The back is composed of several flat plates with crystals fully formed and less densely dispersed throughout.  Attractive and unusual for the species.  $2,500

 

 

 

 

 

 

OKL-350

OKL-350      Cadmian Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Although it only measures in at 7.8 x 5.8 x 4.5 cm this is an important specimen for the collection.  The crystal size is massive with the largest crystal measuring a whooping 3.9 cm in length, yes, over an inch and a half!  The base is a contact area and the specimen sits nicely on this.  It is in fine shape all around with even the edges being very clean (composed of complete crystals).  Only one area along the edges shows the typical breakage associated with separation from it host rock.  The crystals themselves are a honey tan color on the interiors and a light tan to clear on their exterior surfaces.  The central areas on numerous faces are cavernous with smaller crystal terminations protruding from them.  The biggest crystal surfaces show minor dissolution along the edges of these protruding terminations.  It has somewhat of a dirty look until one figures out the tan colors are a view into the honey colored interiors of each crystal.  The luster is excellent but broken up due to the cavernous effect created by the dissolution etching.  This is one impressive piece for the species.  Displayable and hardy.  Viewers will think it has to be a calcite, couldn’t possibly be a smithsonite!  $6,000

 

 

 

 

 

 

OKK-533

OKK-533      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A large thumbnail sized plate of small crystals with liberal tan colored smithsonite overgrowths.  It measures 3.5 x 2.2 x .7 cm overall.  Mounted in a perky box.  No damage.  Lower luster than most.  Great price.   $90

 

 

 

 

 

 

 

OKK-537

OKK-537      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to 1 cm each of good clarity and excellent color and luster.  The small plate measures 1.9 x 1.8 x .7 cm and is damage free.  Mounted in a perky box.   $150

 

 

 

 

 

OKK-536

OKK-536      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An superior grouping of large crystals to 2 cm each of good clarity and excellent color and luster.  The piece measures a 3.4 x 2.8 x 2 cm, barely fitting in a TN sized perky box.   Mounted in a perky box.  This is one of those fantastic examples that displays great in screams of importance due to the unusually large primary crystal.  Some edge contact on very back of big crystal and one tiny crystal low on matrix, at edge is clipped.  Still an impressive thing.    $1,500

 

 

 

 

 

OKH-496

OKH-496      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to 1 cm each of good clarity and excellent color and luster.  The small plate measures 1.9 x 1.3 x .7 cm and is damage free.  Mounted in a perky box.   $160

 

 

 

 

 

 

OKH-498

OKH-498      Dioptase with Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive large crystal of good clarity and excellent color and luster.  The small piece 1.4 x 1.3 x 1.1 cm.  Very small rub on BACK.  Mounted in a perky box.   $200

 

 

 

 

 

OKK-521

OKK-521      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to .7 cm each of good clarity and excellent color and luster.  The small plate measures 1.9 x 1.7 x 1 cm and is damage free.  Mounted in a perky box.  Really attractive and bright.   $280

 

 

 

 

 

 

OKK-527

OKK-527      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to .9 cm each of good clarity and excellent color and luster.  The small plate measures 2 x 1.3 x 1.2 cm and is damage free.  Mounted in a perky box.  Domical and very aesthetic.   $285

 

 

 

 

 

OKK-524

OKK-524      Dioptase      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to .7 cm each of good clarity and excellent color and luster.  The small plate measures 2.4 x 2.1 x 1 cm and is damage free.  Mounted in a perky box.  Really attractive and bright.   $300

 

 

 

 

 

 

OKH-499

OKH-499      Dioptase with Smithsonite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to .7 cm each of good clarity and excellent color and luster.  The large TN measures 3.2 x 2.8 x 2.1 cm and is damage free on its entire display face.  Mounted in a perky box.  Minor smithsonite (tan colored) druse on matrix and as coatings of crystals on one side.  An exceptional one for this size group.  $600

 

 

 

 

 

OKH-497

OKH-497      Dioptase With Calcite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of large crystals to .9 cm each of good clarity and excellent color and luster.  The domical small plate measures 1.6 x 1.4 x 1 cm and is damage free.  Mounted in a perky box.  Displays beautifully from any angle.  $150

 

 

 

 

 

 

OKJ-994

OKJ-994      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection.  This desirable example measures 3 x 1.9 x 1.4 cm overall and displays bright red transparent crystals on black tennantite  crystals.   The entire upper surface is damage free sowing only edge contacts and has high luster crystals to .9 cm each in both single and double terminated examples.  Very nice.  $900

 

 

 

 

 

OKJ-998

OKJ-998      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection.  This desirable example measures 3.2 x 2 x 1.4 cm overall and displays bright red transparent crystals on black tennantite  crystals.   The entire upper surface is coated by crystals with only two showing cleaves.  Very nice.  $300

 

 

 

 

 

 

OKJ-990

OKJ-990      Rhodochrosite      N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection.  This desirable example measures 2.3 x 1.6 x 1.2 cm overall and has a domical surface.  No damage.  An unusual yet attractive pink color with minor brownish stains or mineral overgrowths. Good from all sides.   $220

 

April 2014 Update, Page 2

 

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