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...

Brilliant, gem-like, well-defined aquamarine-blue celestine crystals are disposed in aesthetic contrast on a matrix covered with snowy white colemanite crystals. A piece of exceptional aesthetics from a locality known for its borates, but from which few specimens of this type have been seen.

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.

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. It shows a polished section that can allow us to observe different colour tones, between green and white. We can observe folds called stigmatic, produced by the entry of a viscous fluid (variscite) into a less viscous one. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite with minor strengite. We will send the analytical results to the buyer.

60 €

Buy

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. It shows a polished section that can allow us to observe different colour tones, between green and white. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite with minor strengite. We will send the analytical results to the buyer.

40 €

Buy

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. It shows a polished section that can allow us to observe different colour tones, between green and white. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite with minor strengite. We will send the analytical results to the buyer.

55 €

Buy

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. It shows a polished section that can allow us to observe different colour tones, between green and white. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite with minor strengite. We will send the analytical results to the buyer.

50 €

Buy

A good-sized tremolite crystal, transparent and with defined faces, doubly terminated. The prism has a rhombus cross-section. Specimens of tremolite from this Afghan locality are highly prized for their gem quality.

A group of brilliant pseudohexagonal chalcocite crystals, one of which stands out for its size and definition. These specimens, considered among the finest in the world, come from the M'Passa mining area in the Republic of the Congo, near the border with the Democratic Republic of the Congo. Many of the mining operations closed in the 1980s, but new workings have yielded exceptional specimens like this one.

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 €

Buy

This specimen of menilite opal is very characteristic of this Granada locality. We can see different rounded figures, dolls, or ninots (in Catalan), which have adhered to each other to form a single piece. A curiosity of Spanish mineralogy.

This specimen of menilite opal is very characteristic of this Granada locality. We can see different rounded figures, dolls, or ninots (in Catalan), which have adhered to each other to form a single piece. A curiosity of Spanish mineralogy.

This specimen shows numerous lustrous, parallel-growing cylindrite crystals (Pb₃Sn₄FeSb₂S₁₄). It is accompanied by lighter gray acicular of incaite, a tin-rich Sn(II) franckeite variety (Pb,Ag)₄Sn₄FeSb₂S₁₅, which grow interlaced in the cylindrite. It is from the type locality for both species.

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.

350 €

Buy

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by different fragments of ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. We can see different colour tones, between green and white. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite with minor strengite. We will send the analytical results to the buyer.

60 €

Buy

These specimens from the Turó de Montcada quarry are characterized by a breccia-like appearance formed by different fragments of ampelitic slate cemented with variscite, thanks to the hydrothermal fluids that circulated between them. We can see different colour tones, between green and white. This led us to consider the possibility of an alteration of the variscite that had converted it into crandallite, but X-ray diffraction studies determined that it was dehydrated variscite. We will send the analytical results to the buyer.

65 €

Buy

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 €

Buy

Fehrite is a new species found in Almeria (Spain). Years ago (2012) we identified this species in the Les Ferreres mine (Camprodon) but unfortunatelly we didn't have enough sample to finish detrmination and structural studies. Recently we found some more samples and the characterization was carried out based on the results obtained from the application of various analytical techniques: SEM-EDS, Raman and X-ray diffraction. Les Ferreres mine is the second locality worldwide for the species. We will send all reports to the buyer. In this Catalan mine, fehrite appears as elongated elongated tabular to fibrous crystals, with a delicate bluish-green tone, and fibrous terminations. Usually, it is accompanied by devilline (blue) and brochantite (green). It is the magnesium analogue of ktenasite.

50 €

Buy

An old Spanish specimen pyromorphite formed by numerous crystals, with hexagonal prism shape and a very characteristic yellowish-green colour. The luster is very good. These specimens are difficult to see in the market. It is accompanied by a handwritten label in German.

120 €

Buy

A specimen composed of several good-sized microcline crystals with well-defined faces and edges, accompanied by white albite crystals. A group of smoky quartz crystals with good luster and transparency stands out at the top. This specimen comes from the collection of Peter Seroka (Potsdam, 1942 - L'Escala, 2020), a well-known German collector residing in Catalonia and a lover of feldspars.

Reserved

A very aesthetic and classic specimen of the hard to find and attractive chalcopyrites from the Friedrich-Wilhelm Mine. This specimen shows a brilliant, metallic, semi-iridescent, brass colored crystals of chalcopyrite scattered on the underlying quartz matrix. Richly faceted, with complex forms on the chalcopyrites. Very old material. From the former J. Vilaseca collection (Barcelona).

260 €

Buy

A fine specimen of cinnabar from the classic Spanish mine, Escarlati, in León. This specimen shows various aggregates of interpenetrating mercury sulfide crystals, with good color and visible octahedral shapes. They are arranged on a porous matrix that had been covered with calcite but was removed chemically. Only in this way can we enjoy these crystals. It comes from the Jaime Murria collection (Barcelona).

110 €

Buy

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 €

Buy