Rosell Minerales

Rich specimen showing wire aggregates of native silver, curved, with curls, shiny and with a very aesthetic golden tone. Some have darker areas of acanthite. They are accompanied by small but well-formed hexagonal pearceite-T2ac crystals. With calcite matriz. This piece is surprising when looking at the cavities under magnification. It berlongs from the Sarbaiskoe deposit, the best known silver producing area in Kazakhstan. Very rare to find specimens from this locality.

Size: 5 x 4.8 x 3.1 cm.
Found in ±1990.

This octahedral green fluorite is perched on a druse of quartz, with window forms. It shows defined faces and edges. Color is intense with transparence. On a matrix of feldspar. This is from a small tungsten mine that was worked intermittently in the past including by the Russian government as a source for tungsten back in the 1980s. Few good minerals came out, and fewer still in this size and quality.Fluorescent under LW-UV.

Size: 6.6 x 6.4 x 4.8 cm.
Main crystal: 24 x 20 mm.

Fluorescent under long wave UV

This octahedral green fluorite is perched on a druse of quartz, with window forms. It shows defined faces and slightly curved edges. Color is intense with transparence. On a matrix of feldspar. This is from a small tungsten mine that was worked intermittently in the past including by the Russian government as a source for tungsten back in the 1980s. Few good minerals came out, and fewer still in this size and quality.Fluorescent under LW-UV.

Size: 5.7 x 4.8 x 4.2 cm.
Main crystal: 24 x 22 mm.

Fluorescent under long wave UV

A former bornite specimen of this classic locality for the species. We observe two crystals with a good size and rounded faces and edges. They show an excellent luster and aesthetic iridescence. They are accompanied by a chalcopyrite in a matrix of calcite. A piece with history for the best display.

Size: 10.0 x 7.2 x 4.5 cm.
Main crystal: 20 x 17 mm.
Found in ca. 1990.

A floater aggregate of lanceolated sharp azurite crystals with a more than excellent color and luster. From a mine not well represented in collections.

Size: 4.0 x 3.8 x 3.5 cm.
Found in 2007.

A very rich specimen formed by several azurite crystals that have been pseudomorphed by malachite showing original lanceolated forms, also tabular crystals with  velvety faces due to fibrous malachite. Azurite, with deep color, crystals also observed partially converted into malachite. The brilliance of both minerals is really good, with superb aesthetics. From a mine not well represented in collections and which nowadays is difficult to obtain fine mineral specimens.

Size: 5,1 x 4,7 x 3,5 cm.
Found in 2007.

A floater aggregate of lanceolated sharp azurite crystals with an excellent color and luster, with small malachite pseudomorph after azurite growths. From a mine not well represented in collections.

Size: 3,5 x 3.0 x 2,7 cm.
Found in 2007.

In this specimen we observe groups of brilliant galena crystals showing complex forms with parallel growths. Accompanied by some isolated groups of djurleite crystals, those are distinguished by having less brilliance, greyish tone and iridiscent reddish reflections. Prisms are presented as complex forms, rich in faces, with striations and twinned. Djurleite is an uncommon copper sulfide closely related to chalcocite. Published in LAPIS (2014).

Size: 7,5 x 5,0 x 3,0 cm.
Main crystal: 8 x 3 mm.

A really interesting specimen for its aesthetics, its locality and, of course, by the presence of this rare beryllium silicate, bertrandite. Specimen shows prismatic flattened crystals, well defined, forming rosettes. Perfectly disposed on a matrix of smoky quartz crystals and some brilliant pyrite.

Size: 7,5 x 4,5 x 3,6 cm.
Main crystal: 10 x 2 mm.
Found in ± 1995.