Mixed Minerals — Marin Mineral

Mixed Minerals
June 2, 2025 · 24 specimens

R181 - Morganite sold

Nuristan, Afghanistan
Small Cabinet - 6.5 x 4.5 x 2.9 cm

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Thick, glassy single Morganite crystal from Afghanistan with excellent pink coloration. Transparent with bevelled edges. Ex. Dr. Art Soregaroli collection.

R182 - Tourmaline with Apatite sold

Nuristan, Afghanistan
Small Cabinet - 6 x 5 x 3.5 cm

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Well terminated, lustrous single Tourmaline crystal rising vertically from snow-white Albite crystals. Set around the base are two Apatite crystals and another smaller Tourmaline crystal. The larger Tourmaline is dark with a very thin transparent zone on the termination. The smaller Tourmaline is translucent purple when backlit. Beautiful composition, sculptural and undamaged all around.

R183 - Siderite on Quartz (R) $380 available

Neudorf, Harzgerode, Harz, Saxony, Germany
Miniature - 5.0 x 4.5 x 4.5 cm

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Shiny, tan Siderite crystals atop a druse of Quartz crystals from the historic mines of Neudorf. Neudorf is village in a lead and silver mining district that was most active in the late 19th century and is famous for it's Galena, Bournonite, and Siderite specimens. This is beautiful large plate of crystals that are both on Quartz and have some Siderite crystals coated by tiny Quartz crystals. IFrom the back you can see that it has been repaired, but it's nearly invisible from the front.

R185 - Smokey Quartz $250 available

Anderson's Gully, Moorella, Victoria, Australia
Miniature - 4 x 3.5 x 2.5 cm

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Glassy, transparent smokey Quartz crystals on matrix from Moorella, Australia. This is a great example from the occurrence and was collected long ago. The crystals stand upright on the matrix and are complete all around and undamaged.

R186 - Spessartine sold

Nani, Loliondo, Tanzania
Thumbnail - 3 x 3 x 3 cm

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Large single crystal of Spessartine from Tanzania. These came out in numbers when first discovered but the deposit quickly dried up (and/or mining stopped) and new crystals are seldom seen anymore. This is one from the original finds recently released from a collection. It's translucent with areas of transparency, complete and undamaged.

R187 - Fluorite $100 available

Rogerley Mine, Durham Co., England
Miniature - 4.8 x 3.8 x 3.0 cm

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Transparent, deep green cubic Fluorite crystals from the Rogerley Mine. Daylight reactive with blue highlights. From an old stash of crystals highgraded from Cal Graeber.

R188 - Calaverite sold

Cripple Creek, Teller Co., Colorado, USA
Miniature - 4 x 3.5 x 1.5 cm

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Rich specimen loaded with shiny crystals of Calaverite, a rare Gold telluride mineral, from Cripple Creek. Large, flat, striated crystals are intergrown in a Quartz matrix.

R189 - Tetrahedrite with Quartz $500 available

Casapalca Mine, Casapalca, Huarochiri Province, Lima, Peru
Miniature - 4.0 x 3.0 x 2.5 cm

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Large, sharp Tetrahedrite crystals surrounded by Quartz crystals. The Tetrahedrite has coating of golden Chalcopyrite in areas. Stunning, fine quality miniature Tetrahedrite specimen.

R190 - Copper $750 available

Keewenaw Peninsula, Michigan, USA
Small Cabinet - 6 x 5.5 x 2.5 cm

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Sculptural cluster of Copper crystals from Michigan. Good distinct crystals that have a deep brown patina.

R191 - Veszelyite on Hemimorphite $650 available

Palabanda quarries, Mfouati, Bouenza Department, Republic of the Congo
Small Cabinet - 5.5 x 3 x 2 cm

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Sparkling deep blue crystals of Veszelyite on sky blue Hemimorphite. The crystals occur both isolated and more clustered together. Much of the Veszelite is sprinkled with micro crystals of blue/green Kipushite. Great overall coverage, sparkle, and color with crystals on the backside too.

R192 - Brazilianite $125 available

Brazil
Thumbnail - 2.9 x 2.7 x 1.5 cm

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Cluster of glassy, gemmy Brazilianite crystals. This is a good cluster for a thumbnail with nice composition. Comes with an old label showing a price of $200.

R193 - Hematite sold

Hormuz Island, Qeshm, Hormozgan, Iran
Thumbnail - 2.4 x 1.5 x 1.2 cm

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Two intergrown hexagonal prisms of Hematite, an uncommon crystal form for Hematite that reminds me of a style rarely seen in Kalahari Hematite crytals. Silvery in color with bright metallic luster. These are found in an iron mine on an island located 8 kilometers off the coast of Iran.

R195 - Stilbite, Calcite $125 available

New Street Quarry, Paterson, New Jersey, USA
Small Cabinet - 7 x 5 x 2 cm

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Translucent, flaring crystals os Stilbite on the front face with the backside covered by sparkling white Calcite crystals. The Stilbite are tan colored and reach 2.3cm in size.

TZ235 - Tremolite sold

Merelani Hills, Arusha, Tanzania
Thumbnail - 2.9 x 1.5 x 0.5 cm

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Fine quality terminated single Tremolite crystal with rich green coloration, as good as they get color wise. From the December 2007 pocket, which produced the best colored crystals - you can tell the difference when comparing side by side to Tremolite crystals from other finds. Complete and undamaged single crystal. This is one I sold years ago (for $800) and recently reacquired. Pictured in Figure 79 of the Merelani issue of the Mineralogical Record (Sept.- Oct. 2009 issue).

R199 - Northupite (2 crystals) $200 available

Searles Lake, San Bernardino Co., California, USA
Thumbnail - 1.3 x 1.2 x 1.1 cm

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Two crystals of Northupite, an uncommon sodium, magnesium chloride carbonate. Searles Lake is the Type locality for the species. Both are complete octahedral crystals, one 1.3cm, the other 7mm. The crystals are complete and undamaged, whitish tan in color. The smaller crystal is exceptionally sharp in form.

R200 - Heliodor $300 available

Minas Gerais, Brazil
Miniature - 3.5 x 0.9 x 0.7 cm

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Glassy, transparent golden Beryl var. Heliodor. A doubly-terminated crystal, complete and undamaged with a couple indents where other crystals grew. Beautiful gem crystal from old finds.

R201 - Pyrochlore sold

Panda Hill, Mbeya, Mbeya Region, Tanzania
Thumbnail - 1 x 1 x 0.9 cm

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Large single crystal of Bariopyrochlore (var. Zero Valent dominant member of Pyrochlore Group) from Panda Hill in Tanzania. Panda Hill is the first recorded locality for this variety of Pyrochlore. At 1cm, this is a large sized crystal for this varietal. It's also complete, sharply formed, with decent luster.

R202 - Euxenite $180 available

Maharidaza pegmatite, Ambolotarakely, Ankazobe District, Analamanga, Madagascar
Thumbnail - 1.3 x 1 x 0.6 cm

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Single, complete crystal of Euxenite (Y) from Madagascar. Euxenite is an uncommonly seen rare earth oxide mineral. Comes with an old Minerals Unlimited label.

R203 - Anorthite $150 available

Yoichi District, Shiribeshi Subprefecture, Hokkaido Prefecture, Japan
Thumbnail - 1.4 x 1 x 0.8 cm

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Blocky, white single Anorthite crystal from Japan. Anorthite is the calcium-rich end member of the albite-anorthite feldspar series. Complete all around and translucent.

R204 - Amethyst $170 available

Banska Stiavnica, Banska Bystrica Region, Slovakia
Thumbnail - 2.5 x 1.7 x 1.3 cm

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Single crystal of Amethyst from old finds at Banska. These historic crystals were considered the world's best at the time. This is a complete crystal fully transparent with rich purple color. Old label shows a price of $300.

R205 - Gold sold

Harmanec gold deposit, Harmanec, Banska Bystrica Region, Slovakia
Thumbnail - 2.7 x 2 x 1.5 cm

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Masses of Gold in white Quartz. Old label shows a price of $300.

R207 - Struvite $180 available

St Nikolai church, Hamburg, Germany
Thumbnail - 1 x 0.7 x 0.5 cm

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Complete, well terminated single crystal of Struvite from the Type locality for the species. Struvite is a phosphate mineral commonly found as a product of organic decay and as a constituent of human kidney and bladder stones. This crystal has a possible macabre origin, from MINDAT: 'the source of the decomposing phosphate-rich organic matter under the church which hosted the growth of struvite crystals, with it being variously ascribed to human feces in a medieval sewer, horse manure under a medieval stable, or cadavers in a grave'.

R208 - Fluorite var. Antozonite sold

Wilberforce Radium Mine, Ontario, Canada
Thumbnail - 0.7 x 0.7 x 0.3 cm

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Single crystal of dark purple Fluorite var. Antozonite. Antozonite is a variety of fluorite containing free fluorine as a result of radium bombardment. This is a well formed floater crystal with some chipping on the back, but a complete crystal.

R209 - Coquimbite with Halotrichite and Copiapite $125 available

Dexter No. 7 Mine, San Rafael Swell, Utah, USA
Thumbnail - 2.0 x 1.9 x 1.2 cm

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Coquimbite with Halotrichite and Copiapite

Well formed hexagonal crystals of Coquimbite. Normally purple, these are unusually colored red crystals associated with yellow Copiapite.

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