March 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-489

OKH-489      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 is among the most appealing of all the specimens in the lot 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.  It measures 4 x 3 x 1.4 cm and even show cleanly along its edges with almost no side crystal contacts!  Large rhodochrosite crystals compose the piece and there is also a couple of blades of what appears to be magnetite?  I can’t say enough positive things about this fine piece.  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.  An amazing find in today’s market.   $4,000

 

 

 

 

 

 

OKH-490

OKH-490     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 example is on a matrix of magnesite ore and is covered in an even druse of a slightly lighter red crystals that are totally transparent.  They are small, but are amazingly aesthetic.  The specimen is domical and views well from all sides.  It measures 3.8 x 2.7 x 1.7 cm and has one tiny chip on one very small crystal (only noticeable with close inspection and magnification), less edge contacts which are unusually clean.  The piece views nicely from several sides being quite three dimensional in nature.  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.  Fantastic piece!  $2,500

 

 

 

 

 

 

OKH-491

OKH-491      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 one is very different from all the others in the collection in several ways.  First of all the crystals are a more even pink/ red color and they are on well crystallized manganite. That creates a strong contrast in form and color.  Their form is very unusual in that they are stepped in their surface growth and often skeletal.  It is unknown what the tiny white and tiny clear crystals are.  This is an unusually large specimen measuring 7.5 x 5.5 x 3.5 cm and having a crystallized surface measuring 5.5 x 5.3 cm.  The surface is damage free and very aesthetic.  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.  Very unusual and attractive piece!  $4,000

 

 

 

 

 

OKH-492

OKH-492      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 plate of crystals measures 4.7 x 3 x 1.8 cm.  The crystals are a vibrant red color and stepped in their growth ending with small pinicoid terminations.  With the microscope I can make out 3 small crushed terminations (appearing as white areas) 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.  A very nice piece  $1,600

 

 

 

 

OKL-351

OKL-351    Brochantite and Others     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A small rock with a nice vug filled by blue, acicular crystals.  The opening measures approximately 2 cm and there is a second opening of 1.5 cm on another side.  The vugs contain at least two other minerals, bright blue balls of ? and translucent crystals of?  Wish I could tell you more.  4.5 x 3 x 2.4 cm.  $190

 

 

 

 

 

 

OKL-352

Revers side

OKL-352    Wulfenite on Smithsonite and Others     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Nice tabs of yellow translucent wulfenite to .7 cm on edge rest in a mineral mix, mostly smithsonite.  Other notable mineral in small blue balls appears to be conicalcite.  The specimen measures 5 x 3.5 x 2.7 cm.  Crystallized on all sides except for base.  I don’t see any damage.  Very attractive.  $325

 

 

 

 

 

 

 

OKL-353    Brochantite and Cuprian Smithsonite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A small, almost entirely coated matrix specimen with brochantite and green smithsonite dominating the assemblage.  There are other minerals, as well.  4 x 2.3 x 2 cm.  Damage free.  $375

 

 

 

 

 

 

 

OKL-354

OKL-354     Cobaltoan Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive, damage free specimen with small crystal coating manganite.  Flat plates of this pink smithsonite appear to be casts but it is difficult to tell without having on broken (which none are).  6 x 5.6 x 3.6 cm.  A great bargain at $275

 

 

 

 

 

 

 

 

OKL-355

OKL-355     Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An unusual example with scepter like calcite crystals of a cream color.  It sits nicely a couple of different ways and exhibits clean undamaged crystals to over 2 cm each, all being capped by well formed, sharp rhombohedral crystals.  The specimen is in excellent condition having only edge contacts.  6.5 x 6.2 x 4 cm.  Really unlike most material from Tsumeb.  $380

 

 

 

 

 

 

 

OKL-356

OKL-356     Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This calcite is one of the more common varieties seen from Tsumeb.  It measures 4.8 x 4.2 x 3 cm overall and is made up of bladed, stepped growth, cream colored crystals to 1.3 cm each.  No damage.    $95

 

 

 

 

 

 

 

 

OKL-357

OKL-357     Cuprite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A nice grouping of metallic crystals to 1 cm each in a cluster on matrix.  The piece is an “almost” floater with one tiny edge contact only.  It measures 4 x 2.3 x 2.1 cm.  Very nice.   $225

 

 

 

 

 

 

 

OKL-358

OKL-358     Calcite with Mottramite or Duftite coating   Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  High luster green crystals coating two decent sized, sharply formed rhombs of white calcite.  6.8 x 3.5 x 3.5 with individual crystals to 2.7 cm across.  No damage.  $175

 

 

 

 

 

 

 

OKL-359

OKL-359    Cobaltoan Smithsonite, Pyrite and Quartz on Magnesite Stalactites      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Deep purple pink smithsonites on an aesthetic assemblage of other minerals.  5.1 x 4.8 x 3 cm overall.  Sits flat on its noncrystallized base showing fully mineralized, damage free surfaces from any view including the back.  Aesthetic and interesting miniature.  $600

 

 

 

 

 

 

OKL-360

OKL-360     Willemite       Berg Aukas Mine, Grootfontein, Otavi Mountain Land, Namibia, South West Africa.   Ex. Thomas G. Fowler collection.  Numerous damage free stalactites coated by needles of willemite cover much of the upper surface of this piece.  10 x 3.5 x 3.5 cm.  Base is mineralized too but not as aesthetic.  Images have difficulty showing how three dimensional and attractive this specimen is.  $390

 

 

 

 

 

 

 

OKL-361

OKL-361     Calcite with Magnesite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An aesthetic grouping with balls of metallic, crystallized magnesite intergrown with calcites.  The piece measures 5.1 x 3.4 x 1.5 cm.  A couple magnesite balls on edge are broken off.  $200

 

 

 

 

 

 

OKL-362

OKL-362     Calcite, Dioptase, and Conicalcite?      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This 7.5 x 6 x 4.2 cm has its entire upper surface evenly coated by white, translucent calcites that have surface coatings and inclusions of brilliant diopside and conicalcite crystals.  These crystals have been selectively coated by a second generation of white calcites in micro crystals concealing them for the most part.  Maybe a couple of very minor edge rubs on a calcite or two but nothing that draws any attention.  $350

 

 

 

 

 

 

 

OKL-363

OKL-363     Calcite and Mottramite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  7 x 4.5 x 3 cm cluster of calcites  on a mottramite matrix.  There are a couple chips (cleaves) on the crystals as can be seen.  $50

 

 

 

 

 

 

 

OKL-364

OKL-364     Galena and Quartz      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Single and double terminated quartz crystals on gray cuboctahedral crystals of galena.  Domical specimen with no damage.  4.4 x 3.6 x 3 cm.   $80

 

 

 

 

 

 

OKL-365

OKL-365    Cobaltoan Smithsonite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A hearty specimen measuring 6.5 x 4.5 x 2.3 cm overall.  It is slightly domical and has crystals to approximately .9 cm each.  The color is vibrant and the luster good.  Zero damage and only contact on edges.  Some of the back of the piece is mineralized too.  An excellent example.  $995

 

 

 

 

 

 

OKL-323

OKL-323      Cerussite on Mottramite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is a major specimen and likely center piece for any Tsumeb collection.  All the twinned crystals are very robust and very clear with minimal inclusions and cloudiness.  Selective faces are frosted while most are glassy giving the crystal excellent contrast.  The deep green matrix also sets off these huge cerussites.  The specimen weighs several pounds and measures 10.5 x 8 x 6 cm.  The individual crystals are up to 4.8 cm in diameter.  One missing crystal directly on lower edge of piece from removal, one very small chip on a hollow crystal, a little edge chatter on one crystal, and a tiny chip in one other.  This sounds like a lot of issues but given the enormity of this important specimen it is still important and it certainly displays well as can be seen in the images.  I believe this to be a great bargain and think it should draw a lot of attention.  Price on Request.

 

 

 

 

 

OKL-324

Back

OKL-324       Calcite    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   Very clear crystals are seen on the front, heavily coated, top and back, lightly coated.  They are up to 3.8 cm each.  15 x 9 x 6 cm overall.  Light chipping on several crystal but in good condition overall.  Displays great.  $495

 

 

 

 

 

 

OKL-325

OKL-325      Descloizite    Berg Aukas, Grootfontein, Namibia.  Ex. Thomas G. Fowler collection.   This is the nicest of this material that I have had the privilege to own.  It is very large measuring in at 12.6 x 9.5 x 4 cm.  This domical piece is coated n by blooms of crystals measuring in the hundreds and measuring up to 1.5 cm each.  There are a few chipped or broken crystal but you will find nothing distracting and given the fragility of the specimen it is actually in very amazing condition.  All areas of the piece have well formed crystals without staining , morphing or other issues.  Another important piece from this noteworthy collection.  $4,500

 

 

 

 

 

 

OKL-326

OKL-326     Cuprite and Mimetite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This specimen measures 4 x 3.4 x 2 cm overall and has a clustered group of crystals with individuals to 1.3 cm each (that is the cuprites) and thin needle like mimetites to a cm.  The cuprites are a metallic gray color with flashes of red.  It is an attractive damage free specimen with no points of breakage or contact.  $160

 

 

 

 

 

 

 

 

OKL-327

Base

OKL-327      Cerussite on Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A sculptural piece with an attractive combination of species.  The smithsonite appears to be in two generations with small rhombohedral crystal forming the coating over the entire specimen and larger, slightly pink and slightly rounded, rhombs appearing on top of them.  The cerussite crystals are twins of a slightly smoky color with the best on measuring 1.8 cm and having three rays.  It sits upright on a crystallized base and has two contacts, one on the base edge and a very tiny area on top.  A couple of crystals show chipping but the specimen is in good condition overall.  Very displayable and attractive.  $1,800

 

 

 

 

 

 

OKL-328

Bottom

OKL-328      Cerussite on Smithsonite casts after Unknown      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This specimen appears to be a one of a kind for the collection.  The smithsonite casts are white, mostly, with shades of the rare green more dominant on the bottom and a few edges of the top.  They represent two generations of growth with the green being second generation and in slightly larger crystals.  The backside of the large cerussite crystal is also coated by these green smithsonites and it is probably the only reason it looks translucent in the pics.  The twinned cerussite is very clear and damage free.  It measures 1.6 cm and sits like a lustrous jewel on a bed of smithsonites.  The piece is a floater with only one, almost no-existent little scrape on one edge of one cast.  This faces up and back so is not distracting, and frankly, trivial.  6.2 x 4.2 x 3 cm overall.  An outstanding and unusual specimen.  $3,500

 

 

 

 

 

 

OKL-329

This image is closest to showing true color...there is a light pink cast to the crystals.

OKL-329      Cobaltoan Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive specimen due to the fine contrast between the black magnesite base and the light pink smithsonites coating it almost everywhere.  It measures 5.7 x 5.2 x 3.5 cm and has large, sharply formed pink crystals to 1.2 cm each.  Base contact only with fronts and sides being damage free.  It displays nicely from any direction.  There are several small areas of sparkling smithsonites druse of a lighter color on a few crystals.  An exceptionally fine smithsonites specimen in any regard.  $1,700

 

 

 

 

 

 

OKL-330

OKL-330     Primary Malachite Crystals      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A nice vug of malachite crystals of a rich green color.  Several large mounds.  Damage free.  6.7 x 4 x 4 cm.  $290

 

 

 

 

 

 

 

OKL-330

Inside

Two generations of layers

OKL-331      Dolomite cast after Unknown      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A high luster white and ivory colored cast in two distinct generations.  The first is bright white in color and the second generation, only covering part of the specimen, appears as more of an ivory color.  The color difference is subtle but it is east to see the second generation of dolomite on top of the first.  Zero damage.  7.7 x 5 x 2.3 cm overall.  Domical in form.  $400

 

 

 

 

 

 

OKL-332

Bottom

OKL-332      Cerussite casts after Unknown with Smithsonite and Duftite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  These appear to be casts after tabular or bladed mineral crystals but it is a bit difficult to say for sure.  In any case all surfaces if the piece are coated by clear to slightly smoky cerussite crystals with areas having the accessory minerals in smaller crystals.  The piece is a floater measuring 3.9 x 3.7 x 2.9 cm with cerussite crystals to 1.6 cm.  One tiny contact area looks healed so in outstanding condition.  $380

 

 

 

 

 

 

OKL-333

OKL-333      Calcite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Clear, slightly milky crystals with green inclusions (probably duftite).  Base contact is strong and one big crystal is cleaved.  Odd crystal shape could indicate twinning.  4.2 x 3.5 x 2.2 cm overall with crystals to 2.2 cm in diameter.  $30

 

 

 

 

 

 

OKL-334

OKL-334      Smithsonite, Wulfenite, Magnesite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This piece is a floater with only a few wulfenite crystals being damaged or clipped off.  Good condition overall measuring in at 5.2 x 3.8 x 3.5 cm.  The wulfenites are gemmy and yellow in color and the smithsonites druse, coating most everything except the other crystals, ranges from tan to brownish green to light green in color on lower left in second image.  Dolomite accessory appears as a light brown coloration.  $175

 

 

 

 

 

 

OKL-335

Back

OKL-335      Cobaltoan Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This specimen is composed of a druse of smithsonites over magnesite stalactites.  The form looks tree like and only shows contact on the base and one area on the back.  The coating is very translucent to transparent, high in luster and gives the piece a nice aesthetic look.  No damage.  6 x 5.1 x 3 cm. A very high quality smithsonites specimen  $3,000

 

 

 

 

 

 

OKL-336

Back

OKL-336      Smithsonite on Wulfenite       RESERVED       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This white smithsonite coats nicely formed tabs of wulfenite in a thin layer.  There is moderate damage but I figured someone would be interested in this unusual encrustation pseudomorph.  5.7 x 4.1 x 2.1 cm with crystals to 1.3 cm on edge.  $60

 

 

 

 

 

 

 

 

OKL-337

OKL-337      Smithsonite on Wulfenite    RESERVED     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This white smithsonite coats nicely formed tabs of wulfenite in a thin layer.  There is considerable damage but I figured someone would be interested in this unusual encrustation pseudomorph.  3.2 x 2.9 x 2.9 cm with crystals to 1.6 cm on edge.  This specimen is whiter than the images indicate.  $30

 

Page 2 March 2014 Update

 

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