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.

Curious specimen of calcite from Moscona. Formed by some crystals, one of them predominant, with complex rhombohedrall faces with echeloned growth. Accompanied by tabular barite crystals and on a yellow fluorite matrix.

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.

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.

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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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).

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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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.

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

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.

Excellent specimen formed by a large group of prismatic cerussite crystals completely covered by smithsonite crystals, rhombohedral and very bright. It is a very different piece from what can be seen in this classic Moroccan locality. A display specimen.

These specimens of adamite are among the most aesthetic that this classic Mexican mine has offered us. Botryoidal aggregates of copper-bearing adamite, shiny and also forming sheaves. Under LW ultraviolet light they present an exceptional green fluorescence. Nowadays it is difficult to find specimens with this quality.

Good size crystal of pleonast, a variety of spinel containing Fe²⁺. It shows complex crystalline forms of the octahedron and combinations of the octahedron with the dodecahedron or, more rarely, with those of the cube. A museum size piece, very rare to get.

Very defined barite crystal, with shapes of different orthorhombic prisms truncated by pinacoidal faces. The transparence is excellent. From this classic Moroccan mine for baryte crystals.

Excellent specimen formed by numerous colorless acicular crystals of bultfonteinite, a rare hydrated calcium fluorosilicate, which is accompanied by beige prismatic crystals of olmiite, a hydroxysilicate of calcium and manganese. The specimen is very representative of these species. This is the type locality for olmiite. We include pooldervaartite because it is very common since it forms a series with olmiite.

220 € 150 €

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Group of neptunite crystals, well developed and rich in faces, bright and arranged on a matrix with white natrolite. The contrast is very aesthetic. It belongs from the Nicolau collection (Barcelona). The formula of neptunite indicates its chemical complexity: KNa₂Li(Fe²⁺)₂Ti₂[Si₄O₁₂]₂

This is a rich and a huge size specimen of one of the most unique species in all the mineral kingdom. Cylindrite is a lead, iron, tin, antimony sulfosalt that forms in "cylinder" or "tube" shaped crystals, hence the name. In fact, this species belongs to the only group of minerals that naturally forms rounded, curved or tubular shaped crystals. This specimen is especially nice considering that it is loaded with crystals. The mine at Poopo is the type locality for the species. A museum specimen.

Good size heliodor crystal. With a greenish yellow color, transparent to translucent, with some faces, some rounded and others more defined. A gem with the old label of former Lloid, by Hortensia Durán y Marçal Llòria (Barcelona). Photo is not very representative of the brilliance and transparence.

240 €

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Old specimen of rhodonite from this Peruvian mine. Formed by parallel growths of tabular crystals, with a soft pink color and shine. With pyrite in matrix.

Good-sized specimen of kermesite from this classic Slovak locality. It shows us the characteristic acicular aggregates of kermesite, with reddish reflections on a matrix with stibnite. The specimen comes from the E. Nicolau collection (Barcelona) and was acquired from Joan Viñals (Vilanova i la Geltrú).

150 €

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