Mixed Minerals — Marin Mineral

Mixed Minerals
June 25, 2024 · 15 specimens

P307 - Dioptase $3,000 available

Tsumeb, Namibia
Miniature - 3.2 x 2.5 x 2 cm

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Fine quality large Dioptase crystal on a matrix coated by blueish Dolomite and white Calcite. The main Dioptase is 1.4cm tall, sharp, and highly lustrous. Green Duftite can be seen on small areas of the matrix where the Calcite and Dolomite are not present. Really fabulous thumbnail with a different look than most. Purchased by Jack Crowley from Al McGuinness in 1983 (his collection number is painted on the back).

P308 - Prehnite after Tanzanite $800 available

Merelani Hills, Arusha, Tanzania
Miniature - 4 x 3.0 x 1.8 cm

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Blue Prehnite that has coated or pseudomorphed fan-shaped clusters of Tanzanite. This is a near floater with contact on the left side, otherwise nothing but fine quality crystals all around with some attached Graphite crystals and a few small brown Chabazite crystals. Ex. Mike Keim Merelani suite.

P309 - Pyrite on Alabandite $600 available

Merelani Hills, Arusha, Tanzania
Thumbnail - 3.0 x 2.6 x 2.0 cm

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Sharp single Alabandite crystal from Merelani, source of the world's finest Alabandite crystals. This is a complete, well formed crystal with areas of shiny epitaxial Pyrite on some crystal faces. A small amount of Diopside is present in one face. Ex. Mike Keim Merelani suite.

P310 - Tsavorite, Calcite on Prehnite sold

Merelani Hills, Arusha, Tanzania
Miniature - 4 x 3.0 x 3 cm

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Complete, spherical cluster of yellow Prehnite crystals. Undamaged and well crystallized all around. Gemmy green Tsavorite, Calcite crystals, and Graphite are attached in areas. Ex. Mike Keim Merelani suite.

P311 - Scapolite sold

Morogoro, Tanzania
Miniature - 3.5 x 2 x 1.5 cm

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Gem quality single Scapolite crystal. Well crystallized all around (even the bottom is rehealed!). This was pulled from facet rough decades ago and is internally transparent. Ex. Mike Keim.

P312 - Wurtzite $3,000 available

Merelani Hills, Arusha, Tanzania
Miniature - 5 x 4 x 1.8 cm

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Large single Wurtzite crystal from Merelani, source of the world's finest Wurtzite crystals. Complete all around with good crystal faces and areas of attached Graphite. The front face is more flat and smooth and the back face has more stepped, hexagonal growth features. Translucent red/orange in areas when backlit. Ex. Mike Keim Merelani suite.

P313 - Sapphire sold

Ratnapura, Sri Lanka
Thumbnail - 1.7 x 1 x 0.8 cm

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Doubly-terminated yellow Sapphire crystal. Well crystallized all around with slightly hoppered terminations at each end. Excellent transparency in areas and weighs 15.65 carats. Thick, transparent jewel-like crystal. Purchased over 20 years ago from dealer Steve Perry.

P314 - Sapphire sold

Ratnapura, Sri Lanka
Thumbnail - 2.5 x 0.7 x 0.7 cm

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Doubly-terminated blue Sapphire crystal. Well crystallized all around with classic form and a great, uniform blue color, and sharp edges. Weighs 11.3 carats. Purchased over 20 years ago from dealer Steve Perry.

P315 - Indicolite with Lepidolite $6,500 available

Xanda Mine, Virgem da Lapa, Minas Gerais, Brazil
Small Cabinet - 5.5 x 4 x 3.5 cm

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Thick blue and green Tourmaline crystal with an attached cluster of purple/pink Lepidolite. The Tourmaline has a glassy multi-faceted termination and a rich blue center with more green at the top and bottom. Ex. Terry Szenics.

P316 - Spessartine sold

Tongbei, Fujian Prov., China
Thumbnail - 3.0 x 2.5 x 1.8 cm

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Well isolated orange Spessartine crystals to 9mm on Feldspar with tiny Quartz and Muscovite crystals. Excellent undamaged example I've owned since the initial discovery.

P317 - Spessartine sold

Tongbei, Fujian Prov., China
Miniature - 3.5 x 2.7 x 1.8 cm

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Well isolated orange Spessartine crystals to 9mm on Feldspar with tiny Muscovite crystals. Excellent undamaged example I've owned since the initial discovery.

P318 - Scheelite on Muscovite sold

Mt Xuebaoding, Ping Wu, Sichuan Prov., China
Small Cabinet - 6 x 4.5 x 3.0 cm

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Octahedral Scheelite crystal, 3cm wide, atop a layer of Muscovite crystals. The Scheelite is complete and undamaged with glassy luster, excellent orange color, and areas of transparency.

P319 - Cassiterite with Quartz $2,400 available

Amo Tin deposit, Ximeng County, Pu'er, Yunnan, China
Miniature - 4 x 2 x 2 cm

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Amazingly transparent Cassiterite crystals with Quartz crystals on matrix. The main crystal is 1cm in size with high luster and superb transparency for the species. Both the Cassiterite and the Quartz crystals have inclusions of dark, needle-like crystals of an unidentified mineral. Undamaged, high quality crystals. Purchased in the 1990s.

P320 - Cassiterite $1,800 available

Amo Tin deposit, Ximeng County, Pu'er, Yunnan, China
Miniature - 3.5 x 3 x 3 cm

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Amazingly transparent Cassiterite crystals on matrix. There are 5 crystals in total, the largest is 1cm in size. The crystals looks like exquisite jewels with high luster and superb transparency for the species. Undamaged, high quality crystals. Purchased in the 1990s.

P321 - Tourmaline sold

Mwajanga, near Komolo, Tanzania
Small Cabinet - 6.3 x 3.5 x 2.5 cm

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Two connected Dravite (Tourmaline) crystals from early finds at Mwajanga. The crystals are transparent grey/brown with white 'cats-eye' terminations. This is a floater well crystallized and undamaged all around. Weighs 55.75 grams.

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