Group of garnet crystals belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

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Group of garnet crystals belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

45 €

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Group of garnet crystals belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

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Group of geocronite-jordanite crystals, with striated pseudohexagonal shapes. They have a lighter gray sheen than the galena with which they are often associated. The analyzes show a correlation between geocronite-jordanite, both are isostructural and form series. The crystals analyzed (both these that we present and others) show that the composition moves in the intermediate zone of the series. Therefore, the correct thing would be to label these specimens as geocronite-jordanite, avoiding saying that they are only geochronite. We will send all analyzes to the buyer.
The geocronite-jordanite crystals are accompanied by crystals of sphalerite, of galena, associated with transparent crystals of green fluorite, both cubo-octahedral, the latter truncated by the faces of the cube and the trapezohedron.

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Group of geocronite-jordanite crystals, with striated pseudohexagonal forms. They have a lighter gray luster than the galena with which they are often associated. The analyzes show a correlation between geochronite-jordanite, both are isostructural and form series. The crystals analyzed (both these that we present and others) show that the composition is in the intermediate zone of the series. Therefore, the correct way is to label these specimens as geocronite-jordanite, avoiding saying that they are only geochronite. We will send all analytical reports to the buyer.
The geocronite-jordanite crystals are found on a matrix formed by complex sphalerite crystals, almost black in color, associated with transparent green fluorite crystals, octahedral cubes, truncated by the cube and trapezohedron faces.

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Small silver skeletal aggregates, golden to bronze in color, shiny, and emerging from a mass of native arsenic. This specimen has not been acidified like many specimens we see on the market.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat).

Brilliant aggregates of small safflorite crystals, accompanied by nickelskutterudite. We can see small proustite crystals with a magnifying glass, along with cobalt and nickel arsenates. A specimen from a classic locality.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat). These type of specimens, although they are not "aesthetic", have an essential systematic and historical interest. For lovers of "gray minerals", like myself...

A weighty, lustrous, polished, vein slice of massive breithauptite, with orange-brown nickeline. SEM-EDS has shown the presence of cobaltite, skutterudite and silver. This silver contains mercury, probably eugenite or kongsbergite, not determined before in this famous mining Cobalt area of Ontario. This sample belongs from the J. Vilaseca collection (Barcelona). Really interesting because nowadays samples like this are quite unusual. We will send all analytical results to the buyer.

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This good-sized specimen stands out for its branched nickelin growths, with its characteristic bronze color and shine. We can observe crystals in some cavities. It is covered with small safflorite crystals with a gray metallic luster. It is very interesting to observe this substitution. We can also observe well-defined crystals of nickelskutterudite, partially coated with pink cobalt arsenates.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat). These type of specimens, although they are not "aesthetic", have an essential systematic and historical interest. For lovers of "gray minerals", like myself...

Polished specimen where we can perfectly observe the turquoise veins in a brecchia. The colour is very intense. With some pyrite in matrix. The Meiduk porphyry is one of the most important copper mineral deposits of this country. In Iran, turquoise is called "Ferozah", which translated means "victory." It is Iran's national gemstone.

Group of interpenetrated pyrite crystals with an exceptional luster. This specimen stands out for its complex crystallography, with cube shapes, triglyphic striations, and vertices rich in probably trapezohedral faces. A piece to enjoy in its study, the kind that I like...

65 €

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Group of cube octahedral pyrite crystals forming a very aesthetic and brilliant aggregate.

55 €

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Group of pyrite crystals that show well defined faces of the cube and the octahedron. Very well defined faces and edges, showing triglyphic striations on the faces of the cube and not on the octahedron, as is to be expected. With an exceptional luster. It is accompanied by quartz crystals.

Group of pyrite crystals with cube and dodecahedron faces, with diploid forms, striated faces, certainly complex crystallography, which adds interest to the specimen. Crystals are interpenetrated. The brightness is exceptional, difficult to photograph. It is accompanied by quartz crystals.

Interesting quartz crystals with several inclusions of "petroleum" and other hydrocarbons. The petroleum in these quartz crystals from Madagascar appear brownish yellow and, as with many other petroleum inclusions in quartz, they react to long and short wave UV light with yellow to blue fluorescence. Microscopic examination reveals numerous complex fluid inclusions containing obvious brownish yellow petroleum, gas bubbles presumed to be methane, dark solids of what is likely asphaltite, and a colorless immiscible liquid that could be probably water. Microscopic inclusions in quartz are of particular interest to the collector due to their spectacular UV reaction (gia.edu).

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Interesting scepter quartz crystals with several inclusions of "petroleum" and other hydrocarbons. The petroleum in these quartz crystals from Madagascar appear brownish yellow and, as with many other petroleum inclusions in quartz, they react to long and short wave UV light with yellow to blue fluorescence. Microscopic examination reveals numerous complex fluid inclusions containing obvious brownish yellow petroleum, gas bubbles presumed to be methane, dark solids of what is likely asphaltite, and a colorless immiscible liquid that could be probably water. Microscopic inclusions in quartz are of particular interest to the collector due to their spectacular UV reaction (gia.edu).

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Interesting scepter quartz crystals with several inclusions of "petroleum" and other hydrocarbons. The petroleum in these quartz crystals from Madagascar appear brownish yellow and, as with many other petroleum inclusions in quartz, they react to long and short wave UV light with yellow to blue fluorescence. Microscopic examination reveals numerous complex fluid inclusions containing obvious brownish yellow petroleum, gas bubbles presumed to be methane, dark solids of what is likely asphaltite, and a colorless immiscible liquid that could be probably water. Microscopic inclusions in quartz are of particular interest to the collector due to their spectacular UV reaction (gia.edu).

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Interesting scepter quartz crystals with several inclusions of "petroleum" and other hydrocarbons. The petroleum in these quartz crystals from Madagascar appear brownish yellow and, as with many other petroleum inclusions in quartz, they react to long and short wave UV light with yellow to blue fluorescence. Microscopic examination reveals numerous complex fluid inclusions containing obvious brownish yellow petroleum, gas bubbles presumed to be methane, dark solids of what is likely asphaltite, and a colorless immiscible liquid that could be probably water. Microscopic inclusions in quartz are of particular interest to the collector due to their spectacular UV reaction (gia.edu).

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Interesting scepter quartz crystals with several inclusions of "petroleum" and other hydrocarbons. The petroleum in these quartz crystals from Madagascar appear brownish yellow and, as with many other petroleum inclusions in quartz, they react to long and short wave UV light with yellow to blue fluorescence. Microscopic examination reveals numerous complex fluid inclusions containing obvious brownish yellow petroleum, gas bubbles presumed to be methane, dark solids of what is likely asphaltite, and a colorless immiscible liquid that could be probably water. Microscopic inclusions in quartz are of particular interest to the collector due to their spectacular UV reaction (gia.edu).

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Very esthetic specimen formed by numerous aggregates of crystals of calcite manganoan, very bright, transparent to translucent, forming globular and stalactitic groups very well set on the matrix. They present a slightly pinkish tone due to the presence of Mn. Extremely fluorescent under LWUV, with a spectacular pink to red color. An exceptional piece.

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Rich group of grandidierite crystals, on matrix. Unusually well defined and aerial for the species. Brilliant, translucent and with an intense uniform bluish-green color. We can observe prismatic crystals with terminal faces. A sample of great quality for this rare nesosilicate. With the label of the collector.
Grandidierite was discovered by the French mineralogist, Alfred Lacroix in 1902 and named after French explorer and naturalist Alfred Grandidier (1836-1912), who wrote the great natural history book: "L'Histoire physique, naturelle et politique de Madagascar". The first reported locality for the species is at the cliffs of Andrahomana, on the southern coast of Madagascar. The species is a magnesium, iron, aluminum borosilicate and although it has been found in multiple localities around the world, it's still considered exceptionally rare, especially in gem quality material (mindat).

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Excellent specimen of bournonite from this classic Kosovar mine. Several crystals of this lead and copper sulfoantimonide are disposed on a matrix formed by brilliant crystals of pyrite, sphalerite and galena. The bournonite presents visible cyclic twins, semi-matt luster, with chalcopyrite. They appear covered with calcite that is removed by chemical processes.

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Excellent specimen of bournonite from this classic Kosovar mine. Several crystals of this lead and copper sulfoantimonide are disposed on a matrix formed by brilliant crystals of pyrite, sphalerite and galena. The bournonite presents visible cyclic twins, semi-matt luster, with chalcopyrite. They appear covered with calcite that is removed by chemical processes.

240 €

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Carrollite is a copper cobalt sulfide, with the very finest of the species coming from the DR Congo. This excellent specimen is sharp, well-defined, and has a bright metallic luster. The single crystal is a modified cuboctahedron and accompanied by chalcopyrite crystals in calcite matrix. It has small nicks due to mechanical work to make the crystal appear that do not affect aesthetics. The condition and aesthetics both help make this such a choice display sample.

370 €

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Carrollite is a copper cobalt sulfide, with the very finest of the species coming from the DR Congo. This excellent specimen is sharp, well-defined, and has a bright metallic luster. The single crystal is a modified cuboctahedron and accompanied by chalcopyrite crystals in calcite matrix. The condition and aesthetics both help make this such a choice display sample.