Sulphides: Stefanit
Diagnostic card.
Ag 5 Sb S 4
Diamond orthogonality
Hardness 2-2,5
Specific weight 6,2-6,3
Cleavage is poor
Cracked shell
Color from gray to black
Powder in powder
Glitter metal
Forms most often prismatic isometric or tabular crystals, mostly pseudohexagonal, often twinned. It also occurs in the form of dense masses and in a diffuse state. Color from light gray to iron black.
Diagnostic signs.
Under the influence of light, a dark coating forms. Easily melts. It dissolves in hydrochloric acid.
Origin.
Crystallizes in hydrothermal veins one of the last, most often in association with argentite and pyrarhirite
Place of Birth.
Interesting individual crystals and magnificent twins were discovered in Monte-Narba in Sardinia. Other interesting locations of the crystals are the deposits of the Ore Mountains (Saxony), Cornwall (Great Britain), Changarsillo (Chile), Aulagas (Bolivia), Zacatecas and Arizpe (Mexico), where the stephanite is in paragenesis with polybasite. In the US, stephanite is an important silver mineral in the Comstock-Loud field in Nevada. In addition, he is known at numerous locations in California, as well as in Canada (Ontario).
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Poisonous and radioactive dangerous stones and minerals
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** - radioactive stones and minerals (mandatory check on the standard dosimeter + ban on open sales in case of radioactivity exceeding 24 milli / g / h + additional measures of population protection)
Catalog of minerals and semi-precious stones of the world by groups
** - poisonous stones and minerals
** - radioactive stones and minerals
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