Mixed Minerals — Marin Mineral

Mixed Minerals
August 19, 2024 · 13 specimens

P398 - Calcite on Amethyst sold

Guanajuato, Mexico
Small Cabinet - 8 x 7 x 4.0 cm

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Mound-shaped cluster of rich purple Amethyst crystals from old finds in Zacatecas. Small spheres of white Calcite are preferentially coated on areas of the Amethyst, and also cover the bottom of the specimen (the Amethyst detached after formation and was later coated by the Calcite). Undamaged piece from the Don Boydston collection, acquired from John Seibel about 25 years ago.

P400 - Covellite on Pyrite sold

Butte, Silver Bow Co., Montana, USA
Small Cabinet - 8.5 x 5 x 3 cm

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Iridescent blue Covellite crystals on Pyrite crystals with a transparent Quartz crystal to add ever more flair. The Covellite form thin, bladed crystals and the color combination between the Covellite and Pyrite make this one heck of a showy Butte specimen. Ex. Randy Parnagian collection.

P401 - Scheelite on Quartz $950 available

Yaogangxian Mine, Hunan, China
Miniature - 3.3 x 2.1 x 1.8 cm

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Jewel-like, transparent Quartz crystal with attached Scheelite octahedrons. This is a complete undamaged floater well crystallized on all sides. The Scheelite reach 1.3cm in size. This is an excellent example from this prolific mine that I've owned for over 20 years, acquired from the Carl Acosta collection.

P402 - Scheelite $950 available

Mt Xuebaoding, Ping Wu, Sichuan Prov., China
Miniature - 4.8 x 4.8 x 4 cm

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Single octahedral crystal of orange Scheelite. It's crystallized all around, even on the bottom with only minor chipping. The top half is superb, with glassy faces and a highly transparent tip.

P403 - Scheelite $950 available

Mt Xuebaoding, Ping Wu, Sichuan Prov., China
Small Cabinet - 6 x 5 x 4.5 cm

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Single elongated octahedral crystal of orange Scheelite. It's crystallized all around, complete and undamaged.

P405 - Tanzanite sold

Merelani Hills, Arusha, Tanzania
Thumbnail - 1 x 0.6 x 0.4 cm

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Two connected, parallel-grown, gemmy pink Tanzanite crystals. Though small, it has excellent form, transparency, and the color is a good pink. Undamaged and gem-like.

P406 - Tanzanite sold

Merelani Hills, Arusha, Tanzania
Thumbnail - 1.1 x 0.7 x 0.5 cm

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Single, gemmy fancy-colored Tanzanite crystal. This is an unusual color in my experience, with the front face showing a colorless center with pink edges and blue near the base. When viewed from the side, it's almost colorless. It's pink to yellow down the top (C-axis). Undamaged and water-clear.

P407 - Rhodochrosite sold

N'Chwanning Mine, Kuruman, South Africa
Thumbnail - 1.5 x 1.1 x 1.1 cm

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Cluster of gemmy cherry-red Rhodochrosite crystals. An uncommon pineapple-shaped cluster that is circular in form when looking down on it from the top. Internally, it's looks transparent enough to facet into a gem. Some tip cleavages but overall in good condition. Ex. Tim Sherburn collection with label.

P408 - Azurite with Brochantite $650 available

Milpillas Mine, Cuitaca, Sonora, Mexico
Thumbnail - 3 x 2.5 x 1.8 cm

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Sharp, deep blue Azurite crystals to 2cm in size on green Brochantite crystals. Uncommon association piece for a Milpillas collector.

P409 - 'Spotted' Quartz sold

Orange River, Namibia
Small Cabinet - 7.5 x 2.8 x 2.2 cm

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Scepter-like Quartz with an unusual spotted appearance. The outer layer of Quartz is colored red by Hematite and the lower portions were etched away leaving a red termination and scepter-like appearance. The red area is part dull maroon with lustrous lighter red spots. I got this from Marshall Sussman back in 2013 when most of the red and orange Hematite-included Quartz crystals were being found, and only a couple had this spotted appearance. Complete all around and undamaged.

P410 - Scapolite $450 available

Morogoro, Tanzania
Thumbnail - 2.3 x 1 x 0.7 cm

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Flawless gem Scapolite crystal from Tanzania. Water-clear internally with uniform shape and no damage. Beautiful thumbnail-sized gem crystal, even better than photos.

P411 - Azurite with Chalcocite $950 available

Milpillas Mine, Cuitaca, Sonora, Mexico
Small Cabinet - 5.5 x 4 x 1.2 cm

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Large, complete single Azurite crystal from the Milpillas Mine. This crystal appears to be from a small 2014 find where Azurite was found associated with Chalcocite (see my specimen M130). One side shows attached or included dark Chalcocite (?) along with small areas of vivid iridescent light blue. The whole crystal is complete and shows the bright 'electric' blue that is more common with some of the Milpillas Azurite. There is a bit of attached Quartz along the top edge, but otherwise this is well crystallized all around with good faces everywhere except the thin bottom side where it was attached. Undamaged, large crystal.

P412 - Azurite on Barite with Malachite $1,800 available

Volborthite zone, Milpillas Mine, Cuitaca, Sonora, Mexico
Thumbnail - 3 x 2.8 x 2.2 cm

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Fine quality tabular Azurite crystal on matrix of glassy colorless Barite crystals with spherical Malachite, which is characteristic of specimens from the Volborthite zone or pocket. The crystal glows translucent blue when backlit. A highly aesthetic full thumbnail that I've owned for many years, selected from hundreds of specimens after the April 2015 Volborthite find. Complete all around and undamaged.

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