Mixed Minerals — Marin Mineral

Mixed Minerals
September 15, 2025 · 9 specimens

R433 - Inesite $1,500 available

Kuruman, South Africa
Miniature - 4.8 x 3.5 x 3.5 cm

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Clusters of red/pink Inesite on matrix from South Africa. This is not your typical druse of Inesite! The crystals are translucent and form pinwheel radial aggregates, uncommon and beautiful. Ex. Carl Acosta collection.

R434 - Pyrite on Quartz casts after Fluorite $1,800 available

Quiruvilca Mine, La Libertad, Peru
Cabinet - 10 x 6 x 3 cm

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Sharp, metallic Pyrite crystals on drusy Quartz casts after Fluorite. The Pyrite crystals have bright luster and reach 1.8cm in size. Steve Smale has a specimen from this find pictured in his second book. Ex. Carl Acosta collection.

R436 - Gold with Arsenopyrite sold

Homestake Mine, Lead, Lawrence Co., South Dakota, USA
Small Cabinet - 7 x 5 x 1.5 cm

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Sheets of Gold with Arsenopyrite in white Quartz. The largest leaf of Gold is 1.4cm wide. The back is sawcut and reveals veins of solid Gold running through the Quartz - a significant amount. Discovered in 1875, the Homestake Mine was a deep underground gold mine that operated until 2002. For a period, it was the largest and deepest gold mine in North America. The mine produced more than forty million troy ounces of gold during its lifetime. Despite this, Gold specimens from this mine are scarce. Ex. Gordon Nelson collection, former Head Geologist of the Homestake Mine.

R439 - Amethyst sold

Las Vigas, Vera Cruz, Mexico
Thumbnail - 2.8 x 2.0 x 1.5 cm

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Choice cluster of Amethyst crystals from Mexico. A transparent single crystal rises up at top with a doubly-terminated crystal crossing below. Fine and undamaged with rich purple coloration.

R440 - Galena (twin) with Dolomite $2,000 available

Picher Field, Tri-State Mining District, USA
Miniature - 3.5 x 3.5 x 1.4 cm

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Spinel-twinned Galena crystal with attached Dolomite and Chalcopyrite. These are rare but well known USA classics. Complete all around with the front side showing mostly Galena and the back side showing mostly Dolomite and Chalcopyrite. Ex. Carl Acosta collection.

R442 - Cubanite sold

Henderson #2 Mine, Chibougamau, Quebec, Canada
Thumbnail - 2.4 x 1.5 x 0.5 cm

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Single twinned Cubanite crystal with superb brassy metallic luster and wonderful striations. The crystal is tabular with uniform thickness and is crystallized all around - front, back, and along all the edges - a floater. There are a couple areas of edge chipping, otherwise perfect and the front and back faces present wonderfully with luster and striations. This is a crystal I've owned for over 25 years.

R444 - Copper sold

Rubtsovskiy Mine, Altaiskiy Krai, Siberia, Russia
Miniature - 3.5 x 3.5 x 2.5 cm

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Fantastic, well-crystallized Copper from Russia. Arborescent form with good space between the various branches. Very well crystallized with surface patina that ranges in colors from Copper to different shades of red. Ex. Carl Acosta collection.

R445 - Bastnasite $500 available

Zagi Mountain, Peshawar, Pakistan
Thumbnail - 2.5 x 2 x 1 cm

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Thick, well formed single Basnasite crystal from Zagi Mountain. A thick, tabular crystals that is translucent yellow/brown and crystallized on both sides (both front and back shown). Ex. Carl Acosta collection.

R446 - Benitoite sold

Gem Mine, San Benito Co., California, USA
Thumbnail - 3 x 3 x 1.5 cm

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Single triangular Benitoite crystal on schist matrix with white Natrolite. The Benitoite has good blue color and measures 1.8cm tall.

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