Excellent groups formed by lamellar crystals of claraite, of an intense turquoise blue, on a matrix of dolomite and sulphides. It is accompanied by spheric aggregates of theisite crystals, with a bluish to green color. Also with azurite. Analysis results will be sent to the buyer.
Claraite is a rare copper and zinc carbonate which may contain sulfur and/or arsenic. Theisite is a rare copper and zinc arsenate-antimonate that has been described for the first time in this mine in the Catalan Pyrenees. These mineral species are the second citation in Spain.
We have published a book called "Rocabruna i el seu entorn. La mina de les Ferreres" where you could enjoy all species collected and determined until the date of publication (2014).

Size: 7.2 x 5.5 x 4.6 cm.
Found in 2013.

Globular aggregates formed by lamellar crystals of theisite. With a bluish to green color and brilliance. On a dolomite matrix with barite and chalcopyrite. This mineral species is the second citation in Spain. Theisite is a rare copper and zinc arsenate-antimonate that has been described for the first time in this mine in the Catalan Pyrenees. Accompanied by several azurite, transparent, bright, well-defined and some doubly terminated. Analysis results will be sent to the buyer.
We have published a book called "Rocabruna i el seu entorn. La mina de les Ferreres" where you could enjoy all species collected and determined until the date of publication (2014).

Size: 7.5 x 5.6 x 1.4 cm.
Found in 2013.

Nice specimen formed by several brilliant crystals of sphalerite, with toasted honey color, accompanied by snow-white dolomite crystals and octahedral galena. It comes from a Spanish locality where it is difficult find these species combination.

Size: 7.2 x 5.6 x 3.5 cm.

This sulphur crystal specimen comes from one of the most worldwide famous mine for this element in the province of Agrigento. Nowadays it is difficult to find crystals of this size and less with a reasonable price. It shows very well defined faces and typically rounded edges. The yellow color is very intense, bright and with a remarkable transparence. To add value to the sample we observe various bituminous inclusions into back side. Good size and gem quality.

Size: 4.5 x 4.0 x 3.4 cm.

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

Size: 11.3 x 5.3 x 5.2 cm.
Main crystal: 33 x 25 x 18 mm.
Found in 1990's.

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

Size: 10.5 x 7.7 x 5.0 cm.
Main crystal: 22 x 14 x 13 mm.
Found in 1990's.

These old specimens of pyrite belong to one of those curiosities that Nature offers us. In these pieces we can see crystals those are showing no apparent cubic symmetry. They have, more or less marked, parallelepiped forms unusually flattened. The edges are completely natural and the crystal has been consolidated on its matrix to avoid its possible detachment.
This kind of crystals put into question certain aspects of the cubic symmetry of pyrite. For more information on this topic you can read articles like King & Prewitt 1979 (Amer. Min., 64, 1265-1271).

Size: 8.0 x 7.3 x 4.6 cm.
Main crystal: 26 x 22 x 13 mm.
Found in 1990's.

Rich group of elongated prismatic crystals of crocoite with an intense orange to red color very characteristic for the species. Brilliant and partially covering the goethite and rocky matrix.

Size: 12.4 x 5.8 x 4.5 cm.
Main crystal: 18 x 3 mm.

Rich specimen formed by complex sphalerite and galena crystals partially covered by small but brilliant seligmannite associated with tetrahedrite, orpiment and quartz crystals. With pyrite and chalcopyrite. You can see under magnification very aesthetic orpiment-seligmannite aggregates. A very nice combination.

Size: 8.7 x 7.3 x 3.0 cm.

Silver specimens from Gualba mines are so appreciated by Spanish collectors due to their scarcity. This specimen shows arborescent and granulated aggregates of native silver emerging from the white matrix of calcite (treated with acetic acid). A unique opportunity to get a silver sample of this historic Catalan mine.

Size: 5.9 x 3.8 x 3.8 cm.
Main crystal: 7 x 1 mm aggr.
Found in 1980's.

Calcite is fluorescent under LW-UV.

A very old specimen from Sainte-Marie-aux-Mines. A matrix, full of cavities, those are partially covered by small but brilliant löllingite crystals and arsenic clustered together. With some quartz. We can enjoy this sample under magnification. We have analyzed the specimen and we will send results to the buyer. These specimens are extremely rare on the market.

Size: 6.4 x 5.0 x 4.0 cm.

Ex-col. Eric Martini

Druse of brilliant hyaline quartz crystals, with transparence and well-developed prism. Two of them showing the Japan-law twin, flattened, transparent to translucent. From a classic Peruvian locality which was inaccurated located in Pasto Bueno district, Pallasca province.

Size: 5.0 x 4.5 x 3.2 cm.
Main crystal: 18 x 15 mm
Found in 2015.

Druse of brilliant hyaline quartz crystals, with transparence and well-developed prism. Some of them showing the Japan-law twin. Well defined, flattened, transparent to translucent. From a classic Peruvian locality which was inaccurated located in Pasto Bueno district, Pallasca province.

Size: 6.8 x 3.8 x 3.3 cm.
Main crystal: 13 x 9 mm. (macla/twin)
Found in 2015.

Very aesthetic aggregate of globular gyrolite with defined fluorapophyllite crystals. Nice miniature.

Size: 5.4 x 5.2 x 1.4 cm.

Druse of small torbernite crystals forming rossetes of tabular crystals with a green color.

Size: 4.3 x 3.0 x 2.7 cm.
Main crystal: 1 x 1 mm.

A nice druse of very curious calcite crystals showing rhombohedron terminal faces and the side faces covered with a second generation of calcite with staggered growth of intense white color. They are disposed on a matrix of goethite with manganese oxides. Special one for calcite mineral collectors.

Size: 12.0 x 8.3 x 6.3 cm.
Main crystal: 10 x 10 mm.

Fluorescent under long wave UV

Very "curious" specimen of these opals from the gypsum quarries of Agramón. It is not so common to find them in a consolidated matrix.

Size: 9.3 x 8.5 x 3.8 cm.
Main crystal: 30 x 18 mm.

Group of octahedral crystals of fluorite, nice green color, transparent to translucent and very well defined faces and edges. Peppered by small crystals of pyrite with complex shapes and even tabular appearance. They are disposed on a matrix with calcite and pyrite. From a classic Catalan locality. Fluorescence (UV-LW) is red for calcite and blue for fluorite.

Size: 11.5 x 5.7 x 5.0 cm.
Main crystal: 8 x 8 mm.
Found in ca. 2001.

Fluorescent under long wave UV

The Siglo XX mine is one of the most impressive Bolivian mining localities. It produces some amazing specimens of common species like quartz, few of the with the Japan-Law twin which are are well known in the mineral world. In this sample we can enjoy a good sized Japan-twin quartz crystals, with transparence and luster. This nice twin is disposed on a druse of hyaline quartz crystals.
To give a unique touch to the specimen a group of cassiterite crystals with good brilliance and deep black color, very rich in faces, interpenetrating between them and with some quartz crystals. A superb specimen.

Size: 11.0 x 6.8 x 6.3 cm.
Main crystal: 25 x 15 mm. (macla/twin)

Rich group of heulandite-Ca crystals which form aggregates of tabular crystals with a hexagonal shape. Intense orange-red color, brilliance and disposed on a vug of the igneous rocky matrix. A piece from this classic Italian and European locality for the species.

Size: 7.3 x 6.5 x 4.7 cm.
Main crystal: 10 x 6 mm.

Barrel-shaped crystals of pyromorphite forming a druse from this American classic locality. It consists of a rich group of very brilliant crystals, color varies from olive green to yellowish and orange, rounded forms. They are disposed on a matrix of goethite. It is very uncommon find these specimens in the mineral market.

Size: 6.0 x 5.1 x 2.0 cm.
Main crystal: 4 x 3 mm.

Specimen with a good size from this classic Kosovar mine. A matrix formed by crystals of arsenopyrite, twinned sphalerite, pyrite and some quartz. On them have grown nice aggregates of boulangerite showing a metallic gray fine-acicular crystals, but may have other sulphides of the same group, which are called plumosite. A very brilliant and aesthetic specimen.

Size: 8.5 x 7.8 x 5.2 cm.
Main crystal: 22 mm. glob. aggr.

From a recent finding in an outcrop close to the Proserpina reservoir, near of the interesting city of Mérida (Badajoz). This specimen shows small turquoise crystals forming botryoidal aggregates with a nice bluish and greenish tones, partially covered by a second generation of more yellowish crystals. We'll send a copy of the analysis to the buyer.

Size: 6.9 x 6.5 x 2.4 cm.
Found in 2013.

A curious calcite specimen that shows the top faces of the scalenohedron, with a translucent crystal core area and the outer areas colorless, highly visible at the acute termination. Well defined, brilliant and on a matrix of quartz crystals. Nice.

Size: 10.0 x 5.5 x 5.1 cm.
Main crystal: 6.8 x 3.5 cm.
Found in 2015.

Fluorescent under long wave UV

Superb specimen of fluorite from the mythic vein called Josefa-Veneros. A druse of fluorite crystals showing the cube faces with beveled edges by the dodecahedron. Good brilliance and intense violet color with zoning, more intense on edges. The definition of faces and edges is excellent and the crystal size more than interesting. An opportunity to get a classic from Asturian fluorite, not easy (near impossible) to be found nowadays.

Size: 15 x 7 x 7 cm.
Main crystal: 8 x 8 mm.
Found in ±1975.