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.

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.

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.

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.

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.

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.

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.

A huge size specimen large formed by a rich group of cubic fluorite crystals with an intense, very intense violet color, with some zoning. Translucent and semidull faces. Crystals are disposed on a matrix covered by small quartz crystals. Some fluorite crystals have small damages, without affecting the beauty of the piece. From a Spanish classic locality.

Group of strontianite crystals with an elongated pyramidal habit, forming bundles and aggregates, with color between white to colorless. These specimens appeared in a concrete area of the mine Oriolana (Busot, Alicante) and initially were identified as aragonite or calcite. Further analysis indicated that this was strontianite with some calcium. It indicates that the crystals are zoned and its composition varies within the crystal. They were determined strontianita (majority), celestite, calcite with some quartz (probably due to mechanical mixtures).

Group of strontianite crystals with an elongated pyramidal habit, forming bundles and aggregates, with color between white to colorless. These specimens appeared in a concrete area of the mine Oriolana (Busot, Alicante) and initially were identified as aragonite or calcite. Further analysis indicated that this was strontianite with some calcium. It indicates that the crystals are zoned and its composition varies within the crystal. They were determined strontianita (majority), celestite, calcite with some quartz (probably due to mechanical mixtures).

Very good specimen of bultfonteinite forming white acicular crystals, with prisms slightly beige to orange of olmiite. Two rare species from a mining area well known for systematic collectors. Accompanied by tabular celestine crystals. Good size and better quality.

Superb adamite crystal, vey brilliant, yellow color, curved faces and showing terminal facets on both ends. It is disposed in a very esthetic form on a matrix of goethite. Good size and quality.

An unusual specimen from this Moroccan mining area. Globular aggregates of crystaline conichalcite  with its classic green color, partially covering cavities of the matrix. To give a unique touch of quality to this sample, cavities are covered with bright, water-clear calcite crystals, many of them doubly terminated, and including or covering the conichalcite species. An excellent and brilliant specimen.

On a rocky matrix of granite, partially covered by small but brilliant quartz crystals, some groups and isolated fluorite crystals. Good transparence, brilliance and with a intense green color. A mineral classic from Catalonia.

Rich group of schorl crystals with an intense black color, forming brilliant divergent agreggates, and disposed on a ophitic matrix with epidote crystals. This Catalan locality was well known for its epidote and axinite (Fe) specimens. Along with these species, and on the epidote, appeared from time to time groups of very dark, near black, crystals which once analyzed proved to be tourmaline: schorl.

Druse formed by rhombohedral crystals of very well defined faces and edges and excellent, very intense pink color. Some of the crystals are partially covered by small quartz crystals.

These specimens of Bolivian galena are unusual in collections. These mines on Cerro Sayari (4,300 meters elevation) were mined for silver during the colonial times. In this sample we would like to emphisize a group of sharp galena crystals, with metallic luster and polysynthetic growths, showing cube faces and minor facets of the octahedron. Aesthetic piece and very rare on the market.

Galena specimens from this Kosovar mine are not very common. In this sample we can enjoy a brilliant group of galena crystals of good size, well defined, with faces of the cube and the octahedron. Very aesthetically disposed on a matrix with quartz crystals, lenticular siderite and pyrite.

Rich group of pyrrhotite crystals forming rosettes of tabular crystals of hexagonal shape, with an exceptional brightness. They are disposed very aerial on a matrix partially covered by quartz crystals and dolomite. An exceptionally aesthetic sample from these classic mines.

Groups of orange rosettes of this rare species. Tinzenite is a boro/aluminosilicate of calcium and manganese from the axinite group [see here], and probably the best specimens are from this Italian mine. Also accompanied by quartz crystals and white to pink kutnohorite aggregates.

Groups of orange rosettes of this rare species. Tinzenite is a boro/aluminosilicate of calcium and manganese from the axinite group [see here], and probably the best specimens are from this Italian mine. Also accompanied by quartz crystals.

Vug in basaltic matrix lined with extremely fine acicular crystals of mesolite. From a German locality not well represented in collections.

First appointment for this Moroccan locality. This lead, iron and rich copper sulfate has been analyzed by SEM-EDS, we will send results to the buyer. Beaverite-(Cu) forms yellow earthy masses formed by lenticular crystals. It is accompanied by fibrous malachite crystals and azurite crystal aggregates. In the matrix we have observed the presence of cerussite. Only the combination of colors and species in  this sample is aesthetic itself.

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First appointment for this Moroccan locality. This lead, iron and rich copper sulfate has been analyzed by SEM-EDS, we will send results to the buyer. Beaverite-(Cu) forms yellow earthy masses formed by lenticular crystals. It is accompanied by fibrous malachite crystals and azurite crystal aggregates. In the matrix we have observed the presence of cerussite. Only the combination of colors and species in  this sample is aesthetic itself.

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