Berthierite is a rare iron antimony sulfosalt and not often found in good crystallized specimens. This piece is from the classic locality, the Baia Sprie Mine (Felsőbánya Mine) in Romania featuring dozens of acicular, silvery-grey needles of berthierite in nearly parallel growth, free of matrix. This rich specimen is beautifully accented with a variable iridescent tarnish, giving the piece much color and character. A wonderful example of this rare and classic material from a locality that was mined continuously from the 14th Century until 2006. From the collection of Julio Martínez (València).

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 group of tabular semseyite crystals forming brilliant rosettes. It is accompanied on the matrix with galena, chalcopyrite, sphalerite and some quartz. Nowadays, these specimens are not easy to find.

Group of very elongated prismatic crystals, in parallel growth, very brilliant. The back side has a coating of quartz microcrystals. A piece from the Astor collection acquired in 1974 from Bailey Minerals (Ángel Jesús Talabán García, Segovia 1942-Madrid 2007).

A very interesting specimen of sphalerite that shows a very aesthetic cyclic twin, unusual for the species and for this classic mine. Very brlliant, with galena crystals on matrix.

Thick and good size stibnite crystal from this classic Romanian mine. It presents an elongated prism, striated, with an excellent brightness. Very rich in facets in the upper terminal part, with complex bipyramidal faces. Accompanied by baryte cristals as minor matrix. Nowadays it is difficult to find specimens of this quality from this mine. It comes from a former Austrian collection.

Very thick and good size stibnite crystal from this classic Romanian mine. It presents an elongated prism, striated, with an excellent brightness. Very rich in facets in the upper terminal part, with complex bipyramidal faces. On the main crystal we observe a group of crystals of the same mineral, finer, that suppose a second crystallization. Nowadays it is difficult to find specimens of this quality from this mine. It comes from a former Austrian collection.

Excellent specimen from Herja mine, a world-class Romanian locality for stibnite. This piece is formed by numerous groups of divergent prismatic crystals, very brilliant and with visible terminal faces. Accompanied by small rhombohedral dolomite crystals. It belongs from a former Austrian collection.

More than an excellent specimen from Herja mine, a world-class Romanian locality for stibnite. This piece, of a very good size, is formed by several groups of thick prismatic crystals with visible terminal faces. We can observe a second generation of thin crystals. Nowadays it is difficult to find samples of this quality, for museum display cases. It belongs from a former Austrian collection.

Excellent specimen from Herja mine, a world-class Romanian locality for stibnite. This piece is formed by numerous groups of divergent prismatic crystals, very brilliant and with visible terminal faces. Photographs do not do justice to the beauty of this specimen. Nowadays it is difficult to find samples of this fine quality. It belongs from a former Austrian collection.

Aggregates of laminar semseyite crystals, very brilliant, some with fractures, and on a galena matrix. A classic of Romanian mineralogy. Formerly in the collection of Gerd Resag.

Aesthetic specimen of calcite crystals that form this semi-globular aggregate, with luster. It is accompanied by a small matrix with quartz and chalcopyrite crystals. A classic from the Romanian mine of Boldut; from the A. Trigo collection (Mataró). It shows an intense fluorescence under LW-UV light.

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Nice specimen formed by rosette aggregates of rhodochrosite, with a delicate pink tone, accompanied by tetrahedrite and chalcopyrite crystals. On a matrix with quartz.

Group of small, shiny, gray metallic blades of flattened Chalcostibite crystals, some of them very aerial disposed. Accompanied by brilliant Tetrahedrite and Quartz. Chalcostibite was uncommon at Cavnic mine till 90's finding.