Very good specimen of molybdenite from this locality in Madrid. It appears as well-defined, bright hexagonal crystals with axial growths. It is disposed very aerial on the pegmatitic rock matrix. Very difficult to see and from Joan Viñals col.

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Specimen formed by interpenetrating cubic fluorite crystals that show well-defined cube faces and bevelled edges, with stepped and tile-like growths. With good luster, transparency and marked geometric colour zoning, ranging from sky blue inside the crystals to violet blue on the outside (very intense on some edges).

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Aesthetic specimen of cinnabar, of intense vermilion, found intimately interpenetrated between sheets of gypsum. Under magnification we can see the cyanbar inclusions through the transparent plaster. The specimen comes from this old mine near the Picos de Europa. Specimens like this are difficult to obtain.

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Group of sphalerite crystals with parallel and polycrystalline growths, slightly curved on the faces and edges, transparent to translucent and shiny. When exposed to light from behind, it takes on a honeyed to greenish tone.

Very good-sized specimen of rhombohedral dolomite crystals, very well defined and bright. Transparent to translucent, with greyish tones. Interpenetrated crystals. With an interesting and rare label from the former Sabadell mineral dealer "Blenda".

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Rhombohedral dolomite crystal from this classic Navarra locality. It is disposed very aerial on a dolomite matrix. Three of the faces of the rhombohedron are dotted with small globules of goethite. A very aesthetic miniature.

This specimen is interesting both for the species and for the locality. These are aggregates of pseudomalachite crystals that have grown in a fissure in the matrix formed mostly by quartz, in a small outcrop located on the slope of the "Cerro Viejo", near the Maidevera reservoir.

Very rich specimen formed by several cubic fluorite crystals, with polysynthetic growths on the faces and accompanied by microcrystalline quartz. Transparent to translucent. The violet to purple color is very intense and zoned. Some edges have small chips, but it is an old sample, from the mid-80s, from the collection of Julio Martínez (València).

Aggregates of tabular siderite crystals, with greenish tones, which are disposed on a matrix with small crystals of quartz, galena and baryte. The sample comes from this classic Almeria mine where it is not easy to find specimens of siderite with this quality. From the Aleydis Soliveres collection.

A good-sized specimen from this Extremadura mine formed by numerous bright andradite crystals, with defined faces, and accompanied by magnetite and an orthoclase crystal. From the Soliveres collection.

Specimen formed by a druse of quartz microcrystals on which several groups of cubic fluorite crystals have grown. They have faces that are asymmetrically beveled by the dodecahedron. Its transparency allows us to see a curious geometric zoning of color. The specimen comes from the J. Vilalta collection and the A. Soliveres collection. From a mine from which it is difficult to find pieces.

110 €

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Fehrite is a recent new species found in Almeria (Spain). Some 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.

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Sylvite crystalline aggregate, colorless, transparent and shiny. Specimens of such pure sylvite are not easy to find. This comes from the potassium salt works of the Catalonia basin. Analyzed samples.

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Sylvite crystalline aggregate, colorless, transparent and shiny. Specimens of such pure sylvite are not easy to find. This comes from the potassium salt works of the Catalonia basin. Analyzed samples.

50 €

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Sheet of palygorskite, fibrous, laminated, delicate and at the same time resistant, silky and soft, like no other mineral species. It comes from the Magaña area, in Soria, and was acquired by Emili Nicolau from Joan Viñals in 1999. A Spanish curiosity.

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Aggregates of greenish-yellow autunite crystals along with sheets of creamy yellow sabugalite. A classic of radioactive minerals from Spain. With Manuel de Torres label.

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The specimens that we often see on the market as sylvite or carnallite are usually halite with inclusions of iron minerals. In this case, the specimen has been analyzed indicating that it is mainly sylvite (KCl) with some halite (NaCl) included. The red color is due to inclusions of iron oxydes (hematite). Although it is a salt long exploited in these mines in the Catalan potassium basin, it is a mineral that is sometimes missing from collections.

Group of fluorite crystals with curved edges and faces with tiled growths. Transparent to translucent and with a soft bluish violet zoning. An old sample from this classic Asturian mine.

This interesting sample of kyanite is accompanied by a small label indicating that it is from Santa Marta, in Lugo. The only town like "Santa Marta" would be Santa Marta de Fixós, but we cannot confirm that it comes from that area. Similar pieces have been collected in Muras, also in Lugo.

55 €

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In this small specimen we can see several well-formed cinnabar crystals, bright and transparent, with an intense colour. They are dotted with small rhombohedrons of dolomite, with quartz and pyrite. A very aesthetic miniature.

On the compact quartzite there is a druse of small hyaline quartz crystals, on which various cinnabar crystals have grown. As they are fissure crystals, the largest ones appear flattened, but shiny and with red transparencies. With small drops of liquid mercury.

Almadén cinnabar specimens are well appreciated worldwide. In this specimen we want to highlight the numerous drops of mercury that are deposited (without falling) on the cinnabar and the matrix rock. Also noteworthy are the numerous cinnabar crystals, transparent and defined, with a very intense vermilion color.

Group of galena crystals with very rounded cube-ocathedral shapes and dotted with numerous brilliant sphalerite crystals with hexagonal very rare shape. Very curious.

Aesthetic group of very bright vesuvianite crystals, with striated prisms truncated by pinacoidal faces. They are disposed very aerial on the matrix with grossular. From a Spanish locality known for its skarn (skarnoid) minerals. Prospecting works has been carried out in the area to investigate the possibilities of exploiting tungsten (scheelite).

Classic and elegant specimen from Berbes, with book-shaped baryte crystals, yellowish white in color, on which various aggregates of cubic fluorite crystals stand out, very transparent and brilliant that allow us to see a violet colour zoning. On the back we can see a handwritten attached label.

110 €

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