February 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-484

Bottom

OKH-484      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. 

I find this one to be 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 4.3 x 3 x 2.1 cm and has no damage, less edge contacts.  Several dozen crystals compose the piece.  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.  $5,000

 

 

 

 

 

 

OKH-485

OKH-485      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 bright red crystals that are totally transparent.  They are small, but have considerable visual impact.  The specimen is domical and views well from its sides.  It measures 3 x 2.8 x 2 cm and has no damage, less edge contacts.  The color as intense is it gets and it is easy to see why these are among the very finest and most desirable mineral specimens on the planet.  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.  $2,800

 

 

 

 

 

 

OKH-486

OKH-486      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 8 x 5.2 x 3 cm example has pink transparent crystals on a dark crystallized matrix.  The individual crystals are to approximately .8 cm each and damage free and complete in the central region of the piece where the vug once existed.  Peripheral crystals are not fully formed or only partial crystals because these areas were part of a thin seam vs. a true opening.  The specimen sits on edge and displays well.  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.  $1,500

 

 

 

 

 

 

OKH-487

OKH-487      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 has numerous cleaves as well as clean crystals.  The color is an intense red and the material is transparent to translucent in areas where it is very thick.  It measures 4.4 x 2.9 x 2.1 cm and is composed entirely of rhodochrosite.  Even with the damage it is a nice example and visually very attractive.  It sits nicely and if you can live with some chipping you will get a real deal on this one.  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.  $950

 

 

 

 

 

 

OKH-488

OKH-488      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 bright red crystals that are totally transparent.  They are small, but have considerable visual impact.  The specimen is domical and views well from all sides.  It measures 3.5 x 3.4 x 1.8 cm and has no damage, less edge contacts.  The color as intense is it gets and it is easy to see why these are among the very finest and most desirable mineral specimens on the planet.  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!  $3,700

 

 

 

 

OKL-320

 

Back!?

Top edge

Bottom

Most likely, this is the front view

OKL-320      Cerussite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   This specimen is one of the huge “snowflake” specimens that has become a mineralogical icon and nearly impossible to find for sale.  They are well represented in the world’s important museums but seldom in most collections.  Even Tsumeb specialists have difficulty acquiring these in good specimens: their being so fragile, their rarity, their extreme expense if available, and the fact that the large ones like this were difficult to fit into the miners lunch boxes all make for specimens like this to be exceedingly rare. 

This fine example is narrower than many but is complete in showing the six rays present in the best twins clearly.  This one is unusual in that there is almost no damage, lest one small chip on the back, and it views almost equally well from both sides.  Magnificent is an understatement when it comes to this exceptional mineral specimen.  It could be displayed various ways… if on edge it sits well being fully stable and presentable.  The side that I am referring to as the back is just as lustrous and displayable as the front.  The backs coloration is different with the center of the crystal being a mild yellow color which grades to clear at its extremities.  The overall clarity is average to good for one of these big specimens and the luster is exceptionally strong.  There are two tiny areas of druse coated rock matrix clearly visible in the images but this specimen was clearly a floater in the pocket and has no visible points of attachment.  The base is well crystallized, as well but not as displayable.  There is one repair to the specimen.  It sits great on this base, as I am calling it, but would display very nicely in a vertical alignment.  Very nice in every regard.  Price on Request

 

 

 

 

 

 

 

 

OKL-322

OKL-322      Dioptase    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This large example measures 13.3 x 10 x 9.5 cm and has individual crystals to approximately .6 cm each.  They are gemmy, bright and in good condition.  The open seam id fully crystallized and measures 7 cm long.  There is only one crystal broken within the void so the condition is excellent for the amount of coverage.  Sits nicely for display.  A nice example of some of the most popular material coveted by collectors today.   $2,400

 

 

 

 

 

 

 

 

 

OKH-512

OKH-512      Cadmian Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection, circ. 1900.  This large, damage free example is unusual in its having schalenohedral crystal instead of the more typical blocky ones.  In either case they are uncommon.  This one also has a second generation of very tiny rhombohedral crystals of a lighter color (whitish tan) on these unusual first generation crystals.  The primary crystals are up to a cm each and the entire piece measures in at 10.4 x 5 x 3 cm.  The backside is also fully crystallized with stacks, stalactites, of the rhombohedral second generation crystals It is a floater less one 3.5 cm edge that once showed attachment.  The yellow/ brown varieties of this mineral are rare and Tsumeb is the one world wide locality most noted for them.  This was the only specimen of this type in this extensive collection.  A very fine, large, and pristine example of one of the rarer varieties of smithsonite from Tsumeb.   $2,700

 

 

 

 

 

 

 

OKH-513

OKH-513      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This aesthetic smithsonite has typically formed crystals with an unusual color.  They are what I would describe as a light green, almost metallic grayish green.  They are transparent and high in luster, more so than most smithsonites.  The piece measures 8 x 4.8 x 4 cm overall and has crystals to over a cm each on edge.  There are only a couple very tiny dings which will not be at all evident with even close visual inspection but can be seen with 10x.  It is in great shape in my opinion!  Very sparse hematite? balls on surface appear in brown coloration.  A flashy specimen that sits beautifully on edge an displays nicely from front, top and sides.  $1,900

 

 

 

 

 

 

 

OKH-515

OKH-515      Dioptase    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  These fine crystals are one of the most recognizable and desired crystalline minerals on the planet and are always in high demand no matter where they were found.  The Tsumeb material remains the most popular, and frankly I believe, the most aesthetic dioptase from any location in the world.  We have available a limited quantity of these uncommon specimens in all sizes due to the recent acquisition of the Thomas G. Fowler collection which was rich in this material.

The large specimen described here exhibits sharply formed, double and single terminated crystals to 1.5 cm each on a matrix of SMITHSONITE, not calcite.  One very tiny missing crystal makes the piece in very good condition overall.  It measures 11 x 8.5 x 7.2 cm.  A fine, large, high luster, aesthetic mineral specimen.   $1,500

 

 

 

 

 

 

 

OKK-516

OKK-516    Calcite on Mottramite   Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This specimen shows razor sharp calcites to 4 cm each aesthetically stacked (with the largest on top) on a matrix sprinkled with green mottramite.  The big crystal has a small backside cleave but overall it is in excellent shape for its size.  It displays great showing nice depth of clarity to the crystals that are in most respects clear other than some cloudy veils.  Excellent luster.  10.6 x 7 x 5.2 cm.  Very attractive.  $375

 

 

 

 

 

 

OKH-517

OKH-517      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This aesthetic smithsonite has typically formed crystals to 1.4 cm each that show nice clarity.  The piece is a dome measuring 6.6 x 5.6 x 3.5 cm overall.  It is damage free and shows nice frontal and back views with the sides being only partially crystallized.  Excellent luster.  The brown is not staining, it is where you are seeing through the crystals to areas of brown colored matrix.  The crystals are exceptionally clean and attractive.  $595

 

 

 

 

 

 

 

OKH-518

Back

OKH-518      Cobaltoan Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This aesthetic smithsonite is the only one like it represented in this impressive collection and the only one of its kind that I have seen.  I even searched on-line and can find nothing like it.  It is a light pink cobaltoan specimen but the unusual thing about it is the groves that have formed along one axis of these rounded rhombohedral crystals.  They are crescent shaped, alternate directions on adjoining faces and are filled with a brown substance that is easily seen in the images presented here.  The edges of the specimen are rough from contacts but the piece would have to be described as damage free with nicely formed, satiny luster crystals making up the central stacked region of the specimen.  6 x 5.6 x 4.3 cm overall with crystals to 1.5 cm each.  It is quite impressive visually and likely different from anything even in the serious smithsonite collector’s case.   $1,800

 

 

 

 

 

 

OKH-519

OKH-519      Dioptase    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  These fine crystals are one of the most recognizable and desired crystalline minerals on the planet and are always in high demand no matter where they were found.  The Tsumeb material remains the most popular, and frankly I believe, the most aesthetic dioptase from any location in the world.  We have available a limited quantity of these uncommon specimens in all sizes due to the recent acquisition of the Thomas G. Fowler collection which was rich in this material.

This is a small specimen measuring 3.8 x 2.6 x 1.2 cm overall.  It has a nice even coating of bright crystals on one side.  One pin head sized crystal chip.  The luster is excellent and the price right.  $195

 

 

 

 

 

 

 

OKH-720

OKH-720      Mimetite on Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  The specimen is likely composed of smithsonites casts after anhydrite… the color ranges from a dirty white to a light purple and the luster is very high over its entire surface.  6.6 x 6 x 3.6 cm overall.  The mimetite crystals are a vibrant yellow color, acicular, single and double terminated and scattered about on the display face and sides.  Domical in form with all sides other than bottom and back being fully mineralized and displayable.  Flashy and aesthetic.  $550

 

 

 

 

 

 

OKH-721

Back

OKH-721      Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Water clear!!  What a beautiful example of this mineral.  The piece is nicely coated front and back with only a couple of contacts on back and a small one on one side.  The crystals are in excellent condition, up to 1 cm in length and aesthetically stacked.  The matrix is almost black so the contrast in texture, shade and luster is high.  Sits nicely and is flashier than most smithsonites.  5 x 4.3 x 3.2 cm.  $625

 

 

 

 

 

 

OKH-722

These first three images are correct for color

Back

OKH-722      Cerussite on Smithsonite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This monster could be the King of the collection!  It is a striking specimen, presents an attractive mineral combination, is in wonderful condition, is fully mineralized on all side, is very three dimensional…  it makes an impression when sized up with any smithsonite.  The color is not all that unusual but the form is great an the crystals attain a very respectable size.  There are some contact areas on the back but they are minimal and the front is damage free and consistently of the highest quality over its entire surface.  The twinned cerussites reach 1.7 cm in size and are gemmy.  The overall dimensions of the piece are 11.2 x 10 x 5.2 cm.  This one is a killer in all respects other than having some crazy color.  Yes, expensive but not a crazy price either.  Price on Request

 

 

 

 

 

 

 

OKH-723

OKH-723      Dioptase    Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An attractive grouping of crystals measuring 4.1 x 3.3 x 1.6 cm with crystals to approximately .5 cm each.  Minor chipping as seen in the images but overall crystal condition is good within the central region of the specimen.  Great color and luster as is the case with all of the dioptase specimens.  $275

 

 

 

 

 

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OKG-137

Back

Base

OKG-137    Calcite on Quartz cast after Anhydrite      RESERVED     Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut. Collected by Jerry Marchand.  Mounted on a custom engraved acrylic base.  An amazingly aesthetic and damage free cast after anhydrite.  Great views from all sides with the back showing the open casts better.  Exceptional for the material that came from this find.  8.2 x 5 x 3.6 with the large calcite measuring 3.5 cm and the quartz crystals to 1.6 cm each.  Better in hand!      $750

 

 

 

 

 

 

OKG-144

Best lighting showing actual color and tone.

Back

Base

OKG-144    Quartz cast after Anhydrite     Roncari Quarry, (Tilcon Quarry), East Granby, Hartford, Connecticut.  Collected by Jerry Marchand.  Mounted on a custom engraved acrylic base.  Numerous, divergent anhydrite casts compose this 5.5 x 4 x 2.5 cm specimen.  Small crystal missing on top and chip to one cast on back.  Displays great from front, sides and frankly just fine from the back.  Very good condition for this material.  Specimens of this material will be what the locale should be noted for years from now.   $395

 

Page 2 February 2014 Update

 

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