Sulphides: Cosalit
Diagnostic card.
Pb 2 Bi 2 S 5
Diamond orthogonality
Hardness 2,5-3
Specific weight 6,8-6,9
Color from gray to white silvery
Glitter metal
The mineral is silvery-gray in color. It is represented by prismatic, highly elongated crystals, twisted, assembled into bundles, subparallel, fibrous dense aggregates. Prismatic and acicular crystals, aggregates of variously oriented sixth-person individuals, radiant intergrowths, tangled-needle and dense masses. Rhombo-dipyramid. Cl. The crystals are prismatic, elongated to acicular and hairlike in the c axis. The faces are roughly shaded parallel to the c axis. The twins are not known.
Very weakly anisotropic (more clearly in immersion and in intensive illumination). Structures of germination with galenobismutite and especially with galena; Fusion with bismuthin and native bismuth are known.
Diagnostic signs.
On the coal melts; Silver-bearing varieties give a small Ag lace, with a mixture of KJ and S a thick yellow-green deposit with a bright red border is formed. From royal vodka at once effervesces, gives irising, then blackening plaque.
Origin.
Not too common mineral of hydrothermal veins and pegmatites.
Deposits and applications.
Fine samples of crystals were found on the Alfenz gold mine, near the town of Crodo in Val d'Ossola, in the Piedmont region. Together with bismuthinite it was found in the deposits Falun and Nordmark in Sweden, in Romania in Beitsa (Rezbanya) - together with sphalerite and chalcopyrite; In the silver mine of Kosala in Mexico with cobalt and quartz; In many places in Canada. Tape-like forms included in quartz are noted in Gyakkochayo near Forno near Grigioni (Switzerland) and in Amparindrovato in Madagascar.
It matters almost exclusively as a collector.
Kozalit. Kara-Oba, Kazakhstan. Photo: © А.А. Evseev.
Cosaline (needles up to 3-4 cm) in quartz. Neroyka of the city, Prip. Ural, Russia. Photo: © А.А. Evseev.
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Poisonous and radioactive dangerous stones and minerals
** - Poisonous stones and minerals (obligatory check in chemical laboratory + clear indication of toxicity)
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Catalog of minerals and semi-precious stones of the world by groups
** - Poisonous stones and minerals
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