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.

Bright silvery to bronze aggregate of allargentum (upper left corner) on matrix. Two sides of the matrix are covered with minute safflorite crystals. The allargentum has pseudocrystalline habit.
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...

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Malachite specimens from this Upper Katanga mine are notable for radial aggregates of fine crystals that, taken together, have a velvety appearance and excellent brilliance. Intense green colour, good size and fine aesthetics.

Very esthetic specimen of calcite formed by various flattened interpenetrated rhombohedral crystals, almost lenticular, with very well defined and striated faces. Between translucent to transparent, shiny and on a rocky matrix. It exhibits intense pink to red fluorescence under UV-LW light. Good size and quality.

190 €

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White elongated crystals of pearly luster in parallel growths implanted on groups of crystals of malachite with a silky luster and a very deep and uniform color. From a find ca. 2010 in Bou Beker where this association had not been found before.

Calcite specimens from la Florida mines are known and valued worldwide. Noted for their complex twinned crystals on a prevalent rhombohedra forms, over scalenohedra. In this sample we offer, we have extraordinary crystals in which the predominance of twinned rhombohedrons is very clear and visible. Transparence is excellent, with defined striated faces and edges, undamaged and a visible twin. It has a delicate yellowish tone. It is cleanly implemented on a matrix of dolomite and calcite. A gem of Cantabria, always surprising the collectors for its aesthetics.

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Excellent specimen of Asturian fluorite, from the classic Berbes area, formed by a dolomitic matrix with tabular book-shaped baryte crystals, partially coated with quartz and fluorite crystals. Fluorite crystals present very defined cubic shapes, with transparence, brilliance and a uniform purple to violet color. Very aesthetic specimen from thsi classic Spanish locality.

320 €

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Good-sized specimen covered with numerous cubic to prismatic fluorite crystals, transparent, brilliant and with aesthetic colour zoning. It has slightly beveled edges. A fine quality specimen from this classic Asturian locality, the specimens of which are highly appreciated by collectors.

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Polished section of an iron-manganese nodule. We can perfectly observe the polymetallic concentric growths. This rare and historical specimen comes, according to the label that accompanies it, from surveys carried out at a Soviet base located in the Indian Ocean (southeast area), in a trench called "naturalis" about 5000 m deep. Due to the consolidating treatment of the piece and these data, we can say that it is an old specimen from perhaps the middle of the s. XX. The best-known nodules come from North American investigations in the Clarion-Clipperton area, in the Pacific Ocean, to the west of the USA, or those off the coast of Peru. Interesting as a source of Mn, Co, Ni, Cu... Very rare to find on the market.

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Enstatite, variety bronzite. This specimen shows a group of intergrown crystals of bronzite, with the characteristic brassy-golden iridescence when viewed at varying angles. The effect is related to what we can see in labradorite, this specimen has a lively golden "labradorescence". A member of the orthopyroxene subgroup.

Rich group of orange lenticular crystals of schwartzembergite, analyzed by SEM-EDS, accompanied by seeligerite, of a light yellow color. Both are rare lead cloroiodates. It is one of the several specimens those remembered Dr. Joan Viñals (1951-2013) brought and studied from his trip to Chile in first years of 2000's. With the E. Kucera (Barcelona) label.

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White to bluish globular aggregates of arsenocrandallite, accompanied by brown yukonite. These specimens were the first that Joan Viñals analyzed from this classic Murcian mine and that would lead to the discovery of the barahonaite (Al and Fe). With handwritten label.

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Rich group of small pyromorphite crystals, prismatic, hexagonal and truncated by pinacoidal faces. Good color and shine. Examples of this mine are not easy to come by today. The sample is accompanied by the handwritten label of Joan Viñals.

65 €

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Monazite-(Ce) crystal, floater, rich in faces, with luster and intense brown color. Nowadays finding specimens with this quality is not easy.
These specimens have been analyzed, indicating that cerium is predominant, and that it is accompanied by other REEs such as lanthanum and neodymium, together with thorium, which gives it some radioactivity. We will send the results and label to the buyer.

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Very good monazite-(Ce) crystal, floater, rich in faces, with luster and light brown color. It is accompanied by a cubic crystal of columbite-tantalite embeded in. These specimens have been analyzed, indicating that cerium is predominant, and that it is accompanied by other REEs such as lanthanum and neodymium, together with thorium, which gives it some radioactivity. We will send the results and label to the buyer.

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Excellent monazite-(Ce) crystal, totally floater, rich in faces, with luster and intense brown color. Nowadays finding specimens with this quality is not easy.
These specimens have been analyzed, indicating that cerium is predominant, and that it is accompanied by other REEs such as lanthanum and neodymium, together with thorium, which gives it some radioactivity. We will send the results and label to the buyer.

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Group of strontianite crystals disposed on the rocky matrix. Joan Viñals's label indicates Bédar bridge, which could be the zone of the mining train bridge. It is accompanied by the handwritten label.

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Groups of very well defined chalcocite crystals, with hexagonal pyramidal shapes, with striated faces perpendicular to the main axis and forming aggregates. Metallic gray luster with bluish iridescences. They are disposed on a matrix with brilliant quartz microcrystals. A classic from Kazakhstan, each day scarcer.

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Yellowish-green aggregates of beaverite-(Cu), accompanied by globular groups of green osarizawaite crystals. From this classic Spanish mine.

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This is a really good crystal cluster of bismuthinite from the Mina Tazna in Bolivia. It is formed by large, terminated, prismatic crystals of bismuthinite, divergent, gray metallic. Some crystals show a metallic patina from a thin coating of marcasite/pyrite. On the back side some quartz crystals and gray-white uncovered metallic natural bismuthinite crystals. The Tazna Mine is a historic bismuth-tungsten mine in the high Andes of Bolivia that has produced noteworthy specimens for decades. Samples with this quality are very rare seen on the market. Specially for connoisseur "gray" mineral collectors...

280 €

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