Mixed Minerals — Marin Mineral

Mixed Minerals
September 2, 2025 · 13 specimens

R401 - Tourmaline with Lepidolite sold

Lemon Tree Pocket, Coronel Murta, Minas Gerais, Brazil
Miniature - 4.2 x 4 x 1.5 cm

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Glassy, distinctive Tourmaline from one of the most famous pockets found in Brazil. The Lemon Tree Pocket was found in 2005 and produced these stunning, color-zoned crystals with high glassy luster and areas with rare (for Tourmaline) yellow coloration. This is a crystal I purchased from Daniel Trinchillo when they were first being sold and have held ever since. It's complete all around and undamaged and has the bonus of an attached purple Lepidolite crystal. Weighs 44.41 grams.

R402 - Cobaltian Calcite $1,800 available

Mashamba West Mine, Lualaba, DR Congo
Small Cabinet - 8 x 7 x 3.5 cm

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Vivid, 'hot' pink crystals of Cobaltian Calcite. The color is fantastic and the crystals are good sized for this style, reaching 1.5cm wide. Undamaged vug of translucent crystals with the top color.

R403 - Tremolite sold

Merelani Hills, Arusha, Tanzania
Small Cabinet - 5.5 x 2.7 x 1.0 cm

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Vivid green, doubly-terminated Tremolite crystal from the Merelani Tanzanite mines. This is a good sized crystal I owned for over a decade. It is complete and nearly pristine (minor edge wear) with typical striated prism faces. The Tremolite has multiple flat termination faces on top and a healed base covered by nummerous small termination faces.

R404 - Copper with Calcite $3,500 available

Keweenaw Peninsula, Michigan, USA
Miniature - 4 x 2.5 x 2.5 cm

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Transparent, jewel-like single Calcite crystal with attached Copper. What really sets this one off is an area of included Copper inside the base of the Calcite crystal that is visible when looking into any of the crystal faces. The attached Copper has a darker patina, while the included Copper retains it's bright metallic coloration. Complete and undamaged.

R405 - Smokey Quartz $200 available

USA
Miniature - 4.5 x 2.2 x 1.8 cm

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Sharp, pristine, and transparent single Smokey Quartz crystal I've owned for at least 40 years. Razor-sharp edges with light surface striations on the faces. Complete and undamaged with high transparency.

R406 - Andardite var. Melanite $1,800 available

San Benito Co., California, USA
Cabinet - 10 x 9 x 3 cm

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Large, glossy black Melanite crystals on matrix. The crystals reach 1.2cm in size and are fairly well separated compared to most. I've collected in this area and what is typical is drusy coverage of 1-3mm crystals - this is a great one for the locality!

R407 - Smithsonite with Willemite $2,800 available

Berg Aukas Mine, Grootfontein, Namibia
Miniature - 4 x 2.5 x 2 cm

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Cluster of 3 translucent yellow Smithsonite crystals with attached white Willemite crystals in pristine condition. The main Smithsonite crystal is 3.3cm wide and doubly-terminated. Ex. Charlie Key collection.

R408 - Tourmaline sold

Kunar Prov., Afghanistan
Thumbnail - 3.1 x 3.0 x 1.7 cm

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Glassy single Tourmaline crystal with a blue body color and bright purple termination. This is an older piece I bought in the 1990s and held onto due to the unusual colors. Complete all around and undamaged except for a couple very trial nicks. Weighs 36.16 grams.

R409 - Acanthite $120 available

Imiter Mine, Ouarzazate, Morocco
Thumbnail - 2.5 x 1.8 x 1.7 cm

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Sculptural specimen of Acanthite crystals with individual crystals to 2cm.

R410 - Datolite on Quartz $275 available

Prospect Park, Passaic Co., New Jersey, USA
Small Cabinet - 5.5 x 5 x 4 cm

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Glassy green Datolite crystals atop drusy Quartz. The Datolite crystals reach 1.7cm in size and are glassy and partially transparent. This is an aesthetic, mound-shaped specimen with good green color to the Datolite. Ex. Al and Bernie Haag collection.

R412 - Quartz after Danburite $120 available

Charcas, San Luis Potosi, Mexico
Small Cabinet - 6 x 3.7 x 2.5 cm

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Pseudomorph of Quartz after a single Danburite crystal. The entire outer surface is covered by drusy Quartz crystals. Complete and undamaged.

R414 - Bixbyite on Garnet pseudomorph $275 available

Pismire Wash, Thomas Range, Juab Co., Utah, USA
Thumbnail - 2 x 1.5 x 1.3 cm

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Black cubes of Bixbyite on a large single Garnet pseudomorph. Such pseudomorphs are typically dull grey specimens of Hematite ps. Garnet. This specimen appears to be a Hematite pseudomorph after garnet with additiional pseudomorphism of Topaz on the surface. The Topaz give the lustrous glassy reflections that mimic the geomtric faces of the original garnet crystal. These are uncommon!

P228 - Ludlockite sold

Mina Oujela, Mapimi, Durango, Mexico
Miniature - 4.0 x 3.5 x 1.5 cm

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Fibrous red/orange crystals of Ludlockite on matrix from a recent find at the Ojuela Mine. This was found recently by a local miner searching for Legrandite and shipped directly to me from Mexico. While most specimens showed small areas of Ludlockite, this was the only one with a solid seam of pure Ludlockite running through the entire specimen. Ludlockite is a rare lead iron arsenite species and specimens were previously best known from the Type locality of Tsumeb. Ludlockite specimens from Tsumeb were found decades ago from a single boulder and are very hard to obtain. These recent specimens from Mexico make a once very difficult to obtain species available to collectors.

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