October 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.

 

 

OKL-397

OKL-398    Cuprian Smithsonite and Cerussite with Others      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This 8.3 x 5 x 3.5 cm is most important for its coverage of bright, gemmy green smithsonites.  However, there are numerous other minerals present as accessories in well formed but small crystals.  White balls of what appears to be dolomite?, at least one small spray of what could be mimetite?, black blades of manganite? And the initial coating on the matrix which looks to me to be smithsonite that is brown in color????  Sorry that I don’t have all the answers for this one but if nothing else it is a very displayable, damage free specimen of one of the rare forms of smithsonite.  $700

 

 

 

 

 

 

 

OKL-399

OKL-399     Smithsonite       Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.   This one is a large matrix piece with many hundreds of prismatic smithsonite crystals covering much of it undulating, three dimensional surface.   It measures in at 11.2 x 6 x 4 cm and is in excellent condition showing no visible damage.  It is a bit dirty looking and has a slight pink color not evident in the images.  $350

 

 

 

 

 

 

 

OKL-400

OKL-400    Mimetite with Cerussite, Quartz, and Tennantite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A fine mix of forms, colors, and important minerals from Tsumeb.  From the 1971, “Gem Pocket” the mimetites are gemmy and to about .7 cm in size.  The piece measures 6.2 x 4 x 4 cm and is domical.  There is scattered damage but also good areas showing clean crystals.  $350

 

 

 

 

 

 

OKL-401

OKL-401    Mimetite with Cerussite, Quartz, and Tennantite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  From the 1971, “Gem Pocket” this mimetite is one of those exceptional crystal specimens that made the find famous.  The largest crystal is amazing for its quality.  For the find it can’t be considered exceptional in size measuring in at 1.6 cm, although it is large for the species.  It is however truly gem as the name of the find implies.  I have seen many of these hyped by other dealers as important, and they are NOT even gemmy.  This one has numerous important attributes:

  1. The crystal is gemmy and lustrous.  The largest GEM crystal from the find that I have seen.
  2. The crystal’s termination is unusual for the find.  Most of these crystals formed with a pinacoid or slightly modified pinacoid as a termination.  This one is much more complex. 
  3. The damage is negligible and not visible to the eye…the only damage is a small scrape on the backside of the mimetite’s termination visible with magnification.  All other areas of the piece are damage free.  The piece photographs nicely, although my skills at macro-photography do not show this.
  4. The primary accessory, twinned cerussite, creates an aesthetic wrap around the mimetite crystal, is very transparent like the mimetite, and is complete and damage free.

The specimen is an outstanding miniature that measures 4.4 x 3.9 x 2.3 cm overall.  The proportions are fantastic in relation to the size of this fine yellow mimetite.  Sorry for my poor photography skills.  This specimen is highly photogenic and I believe would easily exceed the Mineralogical Records cover specimens aesthetic value.  This crystal is the same size, far more interesting and GEMMY.  Possibly the most important piece in the collection.   Price on Request.

 

 

 

 

 

 

 

OKL-402

OKL-402    Cerussite, Smithsonite, Mimetite      Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This is likely the finest miniature sized cerussite in the collection or at least the finest miniature sized matrix specimen.  They are exceptional being water clear and standing up high on the contrasting colored matrix.  The upper surface is crystallized with minor examples of the accessory minerals mentioned.  The piece measures 5.3 x 3.6 x 3.3 cm with the large twinned cerussite being 2.5 cm across and the single crystal standing upright measuring 1.7 cm.  This upright crystal has a tiny backside rub that can be seen with magnification otherwise this is a damage free piece.  The damage is so trivial as to not merit discussion but I always feel it important to point out even these tiniest of imperfections.  Expensive but it is exceptionally high in quality for a cerussite from Tsumeb.  $2,900

 

 

 

 

 

 

OKL-403

OKL-403    Cerussite, Smithsonite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  This a fine miniature sized cerussite.  The crystals are exceptional being water clear and standing up high on the contrasting colored matrix.  The upper surface is crystallized with minor smithsonite druse.  The piece measures 3.8 x 3.3 x 2.5 cm with the large twinned cerussite being 2.7 cm across and the single crystal standing upright measuring 1.4 cm.  The crystals are moderately striated making for more difficulty in seeing the internal perfection.  The specimen is damage free and even the edge crystals are complete and showy.  Someone should find this an outstanding value for the quality of the specimen.  $450

 

 

 

 

 

OKL-404

OKL-404      Rhodochrosite on Manganite     N’Chwaning Mines, Kuruman, Kalahari Manganese Field, North Cape Province, South Africa.  Ex. Thomas G. Fowler collection, circ. 1970s.  A beautiful, damage free, showy example of this rare and coveted material.  It measures 5.2 x 2.5 x 2 cm and is well crystallized both front and back.  Fully formed crystals coat the front most richly with the top also having may of these bright pinkish red crystals.  The back has fewer and one side as well.  One side and the base are not coated with crystals.  Under all areas where rhodos appear can be found dark black and highly lustrous manganite crystals.  There are several groups of cream to clear colored crystals that appear to be Cerussite.  They are also highly lustrous like all the species mentioned already.  The piece has zero damage and stands on edge for display.  Very sharp!!  $3,000

 

 

 

 

 

 

 

OKL-406

OKL-406    Calcite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  A large example with a thick coating of tan colored, included calcites to 1.9 cm each on its front.  The back has smaller, clearer crystals.  It measures 11 x 7 x 5 cm overall.  There is one crystal near the edge that is cleaved and a few with minor rubs but overall the specimen is in good shape.  Nice luster and very sharp form to the rhombs of calcite.  Minor accessory minerals on back.   $300

 

 

 

 

 

 

OKL-407

OKL-407    Calcite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  An example with a thick coating of tan colored, included calcites to 2,2 cm each on its front.  The back has smaller, clearer crystals.  It measures 7.5 x 5.5 x 4.1 cm overall.  There are a few minor rubs but overall the specimen is in excellent shape.  Nice luster and very sharp form to the rhombs of calcite.  Minor accessory minerals on back.   $195

 

 

 

 

 

 

 

OKL-409

OKL-409    Cerussite on Smithsonite     Tsumeb Mine, Tsumeb, Otjikoto Region, Namibia, South West Africa.  Ex. Thomas G. Fowler collection.  Cerussite twins to over 2 cm each stand up high in relief off of a manganite matrix coated by well formed gray colored smithsonite crystals.  The entire upper surface, sides and part of base are nicely crystallized and all is damage free.  The piece measures 7.5 x 3.8 x 3.2 cm.  A nice example for quality and form.  $450

 

 

 

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OKG-023

OKG-023     Calcite, and Prehnite with Hematite coatings    Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   6.5 x 6 x 4.5 cm.  A very large calcite crystal with heavy and selective region hematite coatings.  For some reason the tip of this one is not heavily coated.  Minor prehnite balls around the base (visible in first and last images) of the piece but this is not a visible as one would like due to the coatings.  Damage free.  $175

 

 

 

 

OKJ-979

Back

Edge view

Edge view

OKJ-979    Quartz casts after Anhydrite    Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   5.3 x 3.6 x 2.3 cm.  Nice, large parallel growth casts with only two very tiny crystals missing.  Desirable specimen for this find.  $300

 

 

 

OKG-420

Back

OKG-420    Calcite Twin on Quartz Stalactite   Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.  4.6 x 4.2 x 2.7 cm.  Calcites to 4.2 cm.   Exceedingly complex, twinned crystals with excellent clarity in most regions on a partial stalactite.  One cleave on one crystal but it still is very much worth listing and owning.  $160

 

 

 

 

 

OKG-013

Back

OKG-013    Prehnite on Quartz and Calcite with Hematite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   7.4 x 6 x 4 cm.  A fine floater with a nice mix of minerals. The usual selective face coatings on the calcites, clear quartz and green balls of prenhite throughout.  All sides are nicely crystallized and attractive with the back and one edge being darker from hematite (which is sometimes in small blades).  A few small rubs/ chips but none are distracting so this would still qualify as being in nice condition.  $375

 

 

 

 

OKG-417

OKG-417    Babingtonite, Prehnite, Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   5 x 4.5 x 3.1 cm. An unusual specimen with white translucent calcites and light green prehnites.  The babingtonite crystals are small and certainly a rare mineral for this quarry and this specific find.  Displays nicest on edge as seen in the second image and is damage free.  $250

 

 

 

 

 

OKG-442

OKG-205     Calcite on Quartz coated Casts of ?         Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut. 10.5 x 8 x 3.4 cm with calcites to 1.8 cm.   A large plate of tiny quartz and larger double terminated calcites coating one side of this fine specimen.  The matrix is layered quartz on bubbles of ????  There were five or six of these specimen produced in total from this new find and this was the third best that I am aware of.  The piece is more three dimensional than the images show.  Very unusual and interesting piece.  $250

 

 

 

 

 

 

 

OKG-021

OKG-021     Prehnite on Calcite     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   5.1 x 3.5 x 3.5 cm.  These selective face coated and included calcites are really special and unusual.  Satin to glassy luster, depending on the face.  Stepped growth and I would also describe it as being a scepter.  Prehnite balls climbing up all sides with some having hematite coatings.  Small cleave on backside so it views best from sides and front.  Really nice.   $175

 

 

 

 

OKG-018

OKG-018     Prehnite on Calcite       Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   8.3 x 5 x 4 cm.  These selective face coated and included calcites are really special and unusual.  Satin to glassy luster, depending on the face.  Stepped growth and I would also describe it as being a scepter.  Prehnite balls climbing up all sides with some having hematite coatings, also as blades.  This one is exceptional for size and quality having only one tiny Wilbur.  Spectacular example from this important find.   $450

 

 

 

 

OKG-307

OKG-307     Calcite and Quartz     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   7.4 x 4.5 x 1.7 cm.  Hollow calcite schalenohedrons with fillings of quartz and hematite.  Very interesting material of which there were few recovered from the find.  Damage free and priced to go.  $45

 

 

 

 

OKG-267

OKG-267     Calcite Twin on Quartz    Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   8.6 x 6 x 3.1 cm.   The large twinned calcite measures 3.2 x 2 x 1.8 cm.  Light yellow color and good clarity.  very tiny nick on one edge that is tough to see, even in these blown up images.  Displays great.    $225

 

 

 

 

 

OKG-323

Back

OKG-323     Prehnite casts after Anhydrite      Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   4.6 x 4.2 x 2.3 cm.  An unusual, basically one of a kind for appearance for the find.  Great casts with only the most minor of edge contacts in a couple of spots.  Very dark material for this find.  $190

 

 

 

 

OKG-532

Bottom

OKG-021     Prehnite and Calcite casts after Anhydrite with Quartz     Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   5.2 x 4.8 x 3 cm.  Calcite crystals to over 3 cm.  An attractive cluster of complex calcites and light green prehnites.  Back and some edge contacts.  Tiny area of broken prehnite on front where there is a cast running through one of the calcites (near bottom right of first image).  $195

 

 

 

 

OKG-317

OKG-317     Datolite with Apophyllite       Roncari Quarry (Tilcon Quarry), East Granby, Hartford Co., Connecticut.   8.7 x 5.5 x 5.5 cm.  Uncommon material for the find but not for the quarry.  These are gemmy crystals with a light green cast in parallel growth.  They are heavily coated by milky white apophyllite blades a few of which are broken as can be seen in the images, otherwise in excellent shape.  No damage to the fine datolite crystals.  Their surfaces vary in luster with some faces being bright and glassy and others having a matt finish.  $185

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