Kusachiite is an extremely rare binary copper(II) and bismuth(III) oxide with a chemical formula CuBi₂O₄. This sample belongs from the Type Locality: the well-known Fuka mine in Japan.This sample is rich in radial aggregates of kusachiite crystals, with a deep brown to black colour and contasting on the matrix. They are accompanied by calcite, quartz and other species like cahnite (SEM), bismite and chiyokoite (A. Petrov confirmed). We have carried out some SEM-EDS analysis and Raman. With these spectroscopical techniques we have confirmed the presence of the species. We will send all analytical reports to the buyer. 5x85o

350 €

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In this specimen, we can observe various smoky quartz crystals, with a very uniform colour and exceptional transparence. They are disposed on a feldspar matrix, accompanied by various prismatic aegirine crystals with striated faces and a very intense black color. This specimen belongs from the Jaime Murria collection (Barcelona).

Reserved

Numerous bright, orange, dipyramidal wulfenite crystals are disposed on a goethite matrix. They are accompanied by aggregates of calcite crystals. It comes from the Joan Astor collection, who bought it from Eugeni Bareche in 1974, both collectors and mineralogists from Barcelona.

45 €

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The acanthite crystals from this mine located near Guanajuato, Mexico, are world-renowned. The specimens we occasionally find for sale are usually aggregates of cubic-shaped crystals. This specimen we offer stands out for its centimeter-sized, highly defined crystal, with the usual cube faces truncated by the octahedron. The metallic luster is very good and it is arranged airily on a matrix formed by small, hyaline quartz crystals. An exceptional and ancient piece...

This specimen comes from the Nicolau collection in Barcelona and was acquired from the well-known Barcelona mineral dealer, Enric Kucera. The specimen shows an intricate group of stibnite crystals that are almost completely transformed into stibiconite. It is accompanied by Kucera's label.

Reserved

Very aerial topaz crystal on a matrix of quartz and albite. The crystal has well-developed prism faces truncated by the faces of the dipyramids, with excellent transparency, uniform honey color and good luster. It has a small chip on the top back without affecting the quality.

Reserved

A very rich group of octahedral pyrite crystals, with exceptional luster and well defined faces and edges. This mine is the origin of the base for the "Ballon d'Or" award, awarded each year to the world's best football player.

70 €

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A very rich group of octahedral pyrite crystals, with exceptional luster and well defined faces and edges. This mine is the origin of the base for the "Ballon d'Or" award, awarded each year to the world's best football player.

80 €

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A very rich group of octahedral pyrite crystals, with exceptional luster and well defined faces and edges. Accompanied by sphalerite. This mine is the origin of the base for the "Ballon d'Or" award, awarded each year to the world's best football player.

70 €

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An exceptional specimen composed of several pyrite crystals, one of which stands out for its size, with a very remarkable luster. We observe interesting crystallographic growths that show the cube faces with triglyphic striations and the smooth octahedron faces. It is accompanied by small, lustrous quartz and sphalerite crystals. A very interesting piece from both an aesthetic and crystallographic point of view. The basis of the "Ballon d'Or," awarded annually to the best player in the world, comes from this mine.

130 €

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A rich group of cuboctahedral pyrite crystals, with exceptional luster and very defined faces and edges. It is accompanied by sphalerite and quartz. The base of the "Ballon d'Or," awarded annually to the world's best player, comes from this mine. Very good size and remarkable quality.

110 €

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A group of octahedral pyrite crystals, of good size, with exceptional luster and very defined faces and edges. It is accompanied by sphalerite crystals. The base of the "Ballon d'Or," awarded annually to the best player in the world, comes from this mine.

100 €

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A very rich group of octahedral pyrite crystals, with exceptional luster and well defined faces and edges. Accompanied by sphalerite and quartz. This mine is the origin of the base for the "Ballon d'Or" award, awarded each year to the world's best football player.

75 €

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Numerous rhodochrosite crystals are disposed on a druse of quartz crystals, defined, transparent to translucent. They present a very remarkable richness of faces, to be enjoyed under magnification, highlighting numerous reflection twins, with dull faces and bright faces alternating by geometry. A very aesthetic curiosity.

60 €

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A large group of rhodochrosite crystals, with pointed scalenohedron shapes but with striated faces and a very aesthetic pearly luster. The pink-red colour is more intense inside the crystals. It seems that a second generation of rhodochrosite has covered the primary crystals. It is accompanied by crystals of hyaline quartz, together with colourless, well-defined fluorite cubes with opaline faces, except at the vertices, a curious geometry. Aesthetic piece.

65 €

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This mineral species was first identified in Bergen Hill, New Jersey (USA). Stevensite is a rare phyllosilicate of the smectite group, with the formula (Ca,Na)xMg₃-x(Si₄O₁₀)(OH)₂. With black todorokite. This is an early specimen from Långban, Sweden. A systematic curiosity acquired from Shannon by E. Nicolau (Barcelona).

Reserved

A curious specimen composed of several prismatic microcline crystals, some of them interpenetrated by something resembling a Carlsbad twin. They are partially coated by globular aggregates of opal, which fluoresce strongly under ultraviolet light. This specimen comes from the Peter Seroka collection and was acquired in 2007 from Allan Fraser.

Reserved

Highly aesthetic botryoidal malachite aggregates completely covered by a layer of slightly greenish-blue chrysocolla. We can see the malachite, with concentric growths, in some fractures. The beauty of these specimens makes them worthy of the finest collection and display case.

Very aesthetic botryoidal malachite aggregates completely covered by a layer of blue chrysocolla. We can see the malachite, with concentric growths, in some fractures. The beauty of these specimens makes them worthy of the finest collection and display case.

Highly aesthetic botryoidal malachite aggregates completely covered by a layer of slightly greenish-blue chrysocolla. We can see the malachite, with concentric growths, in some fractures. The beauty of these specimens makes them worthy of the finest collection and display case.

A rich druse formed by tarbuttite crystals, Zn₂(PO₄)(OH). They're very brilliant, transparent, and with well defined faces and edges. Kabwe is the type locality for the species. It was acquired from Dr. Viñals.

Reserved

Specimen formed by various aggregates of sheaf-shaped ushkovite crystals, with a distinctive orange color. It is a rare phosphate with the formula MgFe³⁺₂(PO₄)₂(OH)₂·₈H₂O. They are arranged on a matrix of roscherite and rockbridgeite, with white crusts of uralolite and possibly small colorless beryllonite crystals. A very interesting specimen due to the rarity of the minerals present.

Reserved

In this specimen we can observe an idiomorphic good size crystal of tapiolite-(Fe), Fe²⁺Ta₂O₆, that shows us different tetragonal faces. Good luster, intense black colour with iridescence on faces. It stands out on a matrix with albite and muscovite. The analyzes carried out indicate the presence of niobium in small proportions. These results will be sent to the buyer of the specimen.

Reserved

In this specimen, we can see numerous tabular ferberite crystals with a very unusual orientated parallel growth. Very lustrous and intensely black in color, they are arranged on a matrix of clear quartz crystals. This specimen comes from the Nicolau collection (Barcelona) and was acquired from Dr. Joan Viñals.

85 €

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Lovely orange groups of highly lustrous heulandite crystals. Crystals form together beautifully to create these highly aesthetic clusters of unusually orange crystals. Lustre is fantastic for the species.

60 €

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