Cluster of aragonite crystals, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Cluster of aragonite crystals, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Pineapple cluster of aragonite crystals, with transparence, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Cluster of aragonite crystals, very bright and defined. They are known in the area as "sputnik stones" (sic) because of their appearance. They present a color zoning on the surface, between gray and brown. They are floating. A Moroccan curiosity.

Group of good-sized sulphur crystals from a classic Spanish locality, but from a little-known mine, showing a great richness of faces, some brilliance and a canary yellow color. It is arranged in a cavity with calcite crystals. A fine Spanish specimen.

Druse of small, bright and defined descloizite crystals. The specimen from the Nicolau collection is accompanied by the handwritten label of Dr. Joan Viñals. It comes from the type locality for calderonite.

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Globular aggregates of white acicular crystals with a silky luster of oyelite, a rare calcium borosilicate, which are accompanied by very brilliant, transparent and well-defined calcite crystals. Nowadays these specimens are quite difficult to be found. It belongs from the Nicolau collection (Barcelona) and it is accompanied by the handwritten label.

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A very rich specimen of lammerite aggregates, green in color, in several geodes we can observe crystals of this rare copper arsenate. It is accompanied by groups of blue lemanskiite crystals (previously identified as lavendulana).

A particularly fine specimen from this important locality with thick, metallic-foil-like, flat-laying crystals to 35 mm embedded in matrix. Ex. Emili Nicolau Collection.

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Contrasting sparkly dolomite matrix are lustrous, dark green spheres to 1 mm across, of conichalcite. This is an uncommon, calcium, copper arsenate and it is rare in the form of such isolated crystals or crystal aggregates as you see here (forming little ball-shaped growths).This aesthetic specimen is double sided.

Excellent aggregate of prismatic stibnite crystals, very brilliant, with iridescence, which are disposed forming radial aggregates. They are partially covered with fine needles of boulangerite crystals. With small doubly terminated quartz crystals. A very aesthetic, colourful piece with the J. Viñals label and from the E. Nicolau collection.

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Rich groups of mixite crystals, arranged on a matrix with quartz. Joan Viñals' label indicates that it comes from the Daniel mine, in the same area as the waste dumps known as Schmiedestollen, the most famous dump in the Wittichen area, currently heavily restored. It does not belong to any real mine, but was driven to transport minerals from the nearby Alt St Joseph and Gnade Gottes mines, with which it is connected underground (see mindat), which indicates that some specimens from this dumps may belong also from this mine.

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Group of arsenopyrite crystals, very well defined faces amd edges and brilliant, from this classic Spanish mine. With yellowish scorodite. It belongs from the collection of Peter Seroka and it is accompanied by some labels.

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Very elongated quartz crystal, very rich in faces, with excellent transparence. Rock crystal...

Very elongated quartz crystal with a very uniform and aesthetic smoky tone. Defined faces and edges and good transparence.

Laminar crystals of kyanite, with a bluish tone, from this deposit located on the road between Canillas del Aceituno and Sedella. This specimen belongs from the Peter Seroka collection and is accompanied by the label.

60 €

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Excellent specimen of hydroboracite, with a very good size, formed by numerous radial aggregates of acicular crystals. Very good brilliance, transparence and with color zoning, between colorless to slightly honeyed. This specimen has a former owner's handwritten label. A display museum specimen.

160 €

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These specimens from the Siglo XX Mine present defined, brilliant, translucent and light orange colour monazite-(Ce) crystals. They are accompanied by hyaline quartz and black-brown cassiterite on matrix. Some are twinned. Monazite is found in small quantities in this mine.
Monazite gets its name from the Greek word μουάζω "monazein" meaning "to be alone," alluding to its isolated crystals and their rarity when they were first found. Monazite is generally found in granitic pegmatites, but these crystals are found in hydrothermal veins with tin and the absence of thorium (generally an accompanying element of monazite).

190 €

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Very interesting specimen formed by a matrix of native copper crystals, partially covered by numerous red to almost black cuprite crystals, very defined and brilliant. It is accompanied in the matrix by delafossite (CuFeO2) aggregates, such as needles and radiated globules. Representative for the species. With the handwritten label of J. Viñals.

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Group of twinned prismatic scolecite crystals, very brilliant and transparent. It is accompanied by small hyaline crystals of fluorapophyllite-(K), bright and very defined. Scolecite is a rather rare species of the zeolite group from India. With handwritten label by J. Viñals and belonged to the Nicolau collection (Barcelona).

190 €

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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.

Group of prismatic celestine crystals, of very good size and from a classic Spanish locality for the species. It occurs in crystals defined by orthorhombic prisms of different orders. Translucent, brilliant and with a soft bluish tone. It belongs from the E. Nicolau collection (Barcelona), labeled by J. Viñals.

80 €

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Rich group of prismatic crystals of gaudefroyite, a rare calcium and manganese borate-carbonate, with an intense black color. They are accompanied by brilliant hematite crystals, along with barite, calcite and orange andradite.

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A sharp crystal of lazurite, sitting right up on the marble matrix. A representative miniature for this species. Lazurite is the blue component of the 'gemstone' (or, more usually, decorative rock) Lapis Lazuli, which is a lazurite-calcite-pyrite rock that has been mined as a gem material for some 9,000 years. Before the 2021 redefinition, all lazurites were only sulfide-rich varieties of haüyne and not a separate species.

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This specimen is totally different from those that we usually see in the market of this Moroccan locality. The matrix is a group of quartz crystals, with a soft amethyst tone, and partially covered with chalcedony, in tiny, shiny crystals. On this matrix there is a large group of goethite crystals, lanceolate, dark brown in color and also covered with chalcedony. But millimeter quartz crystals stand out above them, most of them doubly terminated. I had never seen specimens that looked like this. Very interesting.