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.

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.

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 €

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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 €

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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.

Reserved

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 €

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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 €

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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 €

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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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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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In this specimen, we can observe several hexagonal pyrrhotite crystals that have been completely replaced by pyrite. The luster is very good, and they stand out in a matrix formed by numerous quartz crystals. With black sphalerite. A very interesting and aesthetic pseudomorphosis.

100 €

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The anatase crystals from this Norwegian locality are a classic of world mineralogy. They are notable for their size. In this specimen, we see a crystal formed by a tetragonal bipyramid truncated at the vertices by pinacoids. Growth contacts and some small chips can be observed, but they do not detract from the quality of the specimen. It is disopsed very aerial on a small quartz matrix.

Aesthetic slab of chalcedony, a translucent cryptocrystalline variety of quartz, with layered growths, blue-gray tones, and botryoidal. It belongs from the Jaime Murria collection (Barcelona).

55 €

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Group of andradite crystals, which show us very well defined faces of the dodecahedron truncated at the edges by those of the trapezohedron. It has an intense brown color and a more marked shine on the trapezohedron faces. Specimen from this classic Russian town that is rare today.

220 €

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The Yinnietharra dravite crystals are a classic of world mineralogy. Nowadays they are not common and can only be obtained from old collections that were lucky enough to be formed when the mines were worked. This specimen shows us a good group of doubly terminated dravite crystals, with very defined faces and edges, shiny and with the characteristic toasted honey color. They are accompanied by muscovite. An AMAZING specimen!!!

290 €

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These selenite gypsum specimens show the "swallow tail" and reverse twinning. They show a certain transparence, which allows us to see the inclusions, and a good brilliance due to the natural polishing of the gypsum. The most interesting thing, in my opinion, is this rounded appearance due to the erosive action of the sea spray, since they appear in the clays of the Eocene cliffs. A very English curiosity from Jaime Murria's collection.

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Very good sized fluorapophyllite-(K) crystal. It shows prism faces truncated by the dipyramid. Very bright, transparent to translucent. On matrix with stilbite-Ca. A classic from India.

55 €

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A very brilliant group of epidote crystals with an intense and deep green color. It shows a very rare habit for the species. We can observe psedo-octahedrical forms in one side and a flattened shape generated by a extremely developed frontal pinacoid. To increase its scientific interest we must say that it is magnetic due to magnetite inclusions.

120 €

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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.

220 €

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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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An excellent specimen of quartz, with a slight smoky tone, which presents very aesthetic "window" geometric growths. Doubly terminated and with complex crystallography. With inclusions.

Floating specimen of copper, formed by dendritic to arborescent aggregates of copper crystals.

Native copper specimen formed by various rounded copper crystals, in arborescent to dendritic growths.

A very good-sized specimen of schorl, with multiple prism faces and rhombohedral terminal faces. The brilliance is excellent and the black colour is very intense. A great specimen from this classic African locality.