Mixed Minerals — Marin Mineral

Mixed Minerals
December 20, 2025 · 14 specimens

This is an update of cherished pieces from my personal collection. I have three kids in college - my loss is your gain, give yourself a gift for the holidays! Seasons greetings!

R657 - Celestite sold

Sakoany deposit, Mitsinjo District, Boeny, Madagascar
Small Cabinet - 8.5 x 7 x 6.5 cm

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Gemmy blue Celestite crystals on matrix from the well known Sakoany deposit. Sculptural specimen with a mixture of smaller drusy crystals and tall crystals to 4cm sticking straight up off the matrix. The crystals are highly lustrous, glassy and undamaged. Ex. Mike Keim.

R658 - Spessartine $3,500 available

Pakistan
Miniature - 3.4 x 3.4 x 2 cm

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Satiny red Spessartine with a wild, unusual 'honeycomb' growth structure on front. Well crystallized all around undamaged floater specimen with good translucency. I've only ever seen a few of these before, this one acquired perhaps 20 years ago. Ex. Mike Keim.

R659 - Apatite on Quartz $2,800 available

Panasquiera, Portugal
Small Cabinet - 5.2 x 2.5 x 2 cm

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Two large, glassy purple Apatite crystals (and some smaller ones too) on a Quartz crystal. Well crystallized all around floater specimen. The largest Apatite is 1.8cm. Ex. Mike Keim.

R660 - Danburite $200 available

Charcas, San Luis Potosi, Mexico
Thumbnail - 3 x 1.3 x 1.2 cm

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Exceptionally transparent, undamaged single Danburite crystal. Well crystallized all around. Much brighter and dazzling in person - you won't be dissappointed! Ex. Mike Keim.

R661 - Danburite $200 available

Charcas, San Luis Potosi, Mexico
Thumbnail - 2.6 x 1.3 x 1.1 cm

(click on an image to enlarge)

Exceptionally transparent, undamaged single Danburite crystal. Well crystallized all around. Much brighter and dazzling in person - you won't be dissappointed! Ex. Mike Keim.

R662 - Willemite $2,250 available

Berg Aukas Mine, Grootfontein, Namibia
Miniature - 3.4 x 2 x 2 cm

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Interconnected spherical clusters of translucent orange Willemite crystals. A floater cluster without matrix. These translucent robust masses are far more rare from the mine than the more typical acicular Willemite crystals. Ex. Mike Keim.

R663 - Amethyst sold

Gobobseb Mtns., Brandberg area, Namibia
Small Cabinet - 8 x 2.2 x 2.0 cm

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Fine, tall single Quartz crystal with deep purple 'grape jelly' Amethyst phantoms. Complete all around and undamaged. Ex. Mike Keim.

R664 - Chalcocite $4,000 available

Flambeau Mine, Ladysmith, Wisconsin, USA
Small Cabinet - 5.2 x 4 x 2.5 cm

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Satiny metallic crystals of Chalcocite with shimmering purple and blue iridescence. Complete all around and undamaged. Ex. Mike Keim.

R665 - Augelite sold

Mundo Nuevo Mine, La Libertad, Peru
Thumbnail - 2.1 x 1.8 x 1.5 cm

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Cluster of deep apple green Augelite crystals. Main crystal is 2.1cm and doubly-terminated. Undamaged. Ex. Mike Keim.

R666 - Augelite $1,500 available

Mundo Nuevo Mine, La Libertad, Peru
Thumbnail - 1.9 x 1.8 x 1.2 cm

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Thick, glassy single Augelite crystal with deep apple green color. Nearly pristine with very minor edge wear. Ex. Mike Keim.

R667 - Spessartine $2,000 available

Navegador Mine, Minas Gerais, Brazil
Thumbnail - 3 x 2.5 x 2.4 cm

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Transparent red Spessartine crystal with the crazy geometric growth formations these are known for. Fine undamaged example that is complete and well crystallized all around. I've had many of these over the years but held onto this one due to it's interesting form. Undamaged. Weighs 20.23 grams. Ex. Mike Keim.

R668 - Sphalerite on Quartz sold

Shuikoushan Mine, Hunan, China
Small Cabinet - 7 x 5 x 3 cm

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Transparent red Sphalerite clusters on drusy Quartz crystals. I bought this from dealer Debbie Meng upon her return from China back in the 1990s when these first started coming out. This was my top pick from the many (100-200?) she brought back. The main cluster is 2cm wide. Ex. Mike Keim.

R669 - Crocoite $1,800 available

Red Lead Mine, Zeehan mining district, Tasmania, Australia
Miniature - 3.5 x 0.6 x 0.4 cm

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Deep orange/red, translucent to transparent single Crocoite crystal from the Red Lead Mine. Complete and undamaged. Ex. Mike Keim.

R670 - Lawsonite $2,250 available

Mendocino County, California, USA
Miniature - 4 x 3.5 x 2.2 cm

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Translucent pink orthorhombic crystals of Lawsonite to 8mm on Glaucophane. Found years ago at an undisclosed locality in Mendocino county, I acquired all the specimens (about 100 pieces) directly from the field collector. This one was by far my favorite of them all due to the quality of the crystals and the large isolated crystal set adjacent to a 2cm tall tower of crystals that rise straight up off the matrix. Ex. Mike Keim.

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