The allanite-(Ce) specimens from Trimouns are a classic of French mineralogy. It should be said that if these crystals are analyzed compositionally, a zoning with dissakisite-(Ce) is observed. Both species belong to the epidote group and are compositionally differentiated by the presence of Fe(II) (allanite) and Mg (the second). In this specimen we can observe several well-defined crystals of this mineral, one of them larger, which contrasts with the dolomite matrix. i6u6a

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Group of green to brownish-green pyromorphite crystals, with very marked hexagonal shapes and defined faces and edges. On matrix. It belongs from this classic Spanish mine and from which good quality specimens like this one have come out. With Viñals handwritten label.

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A very good-sized specimen of atacamite formed by numerous radial aggregates of tabular crystals, of intense green colour and transparence, which are disposed on a matrix with chrysocolla and malachite. This specimen has both sides worthy of a display case. It is accompanied by the handwritten label of Joan Viñals.

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Excellent specimen of fluorapophyllite-(K) with very good size crystals that show the shapes of the tetragonal prism with faces of the dipyramid truncated by the basal pinacoid. Very good transparency, brilliance and definition. It is disposed very aerial on a matrix with stilbite. With handwritten label by Joan Viñals.

130 €

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Shungite is a rock, an intermediate form between the amorphous carbon and the graphite containing carbon (30%), silica (45%), and silicate mica (about 20%). Schungite carbon is a fossilized organic material of sea bottom Precambrian sediments of high level of carbonization containing the fullerene-like regular structures. Shungite got its name after the village of Shunga in Karelia (Russian Federation), located on the shore of Onezhskoe Lake, where is located the only one mineral Zazhoginsky deposit of shungites on the territoty of the Russian Federation.
Shungite has a heterogeneous molecular structure in which carbon occurs as 10 nm globules irregularly distributed within carbon showing no structure. The unusual physicochemical and structural properties of shungite are used in diverse industrial and environmental applications including metallurgy, water purification, thermolysis and organosynthesis of cyclic hydrocarbons. Shungite is an effective sorbent for removal of organic and inorganic substances, pathogenic bacteria and heavy metals from contaminated water (Ore Geology Reviews, 2004; 24, 1-2:135-154).

Good size garnet crystal 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.

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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 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 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 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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