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FREIESLEBENITE

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Originally appearing in Volume V11, Page 94 of the 1911 Encyclopedia Britannica.
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FREIESLEBENITE , a rare See also:

mineral consisting of sulphantimonite of See also:silver and See also:lead, (Pb,Ag2)5Sb4S11• The See also:monoclinic crystals are prismatic in See also:habit, with deeply striated See also:prism and See also:dome faces. The See also:colour is See also:steel-See also:grey, and the lustre metallic; hardness 22i specific gravity 6.2. It occurs with See also:argentite, See also:chalybite and See also:galena in the silver See also:veins of the Himmelsfurst mine at See also:Freiberg, See also:Saxony, where it has been known since 1720. The See also:species was named after J. K. Freiesleben, who had earlier called it Schilf-Glaserz. Other localities are Hiendelaencina near See also:Guadalajara in See also:Spain, Kapnik-Banya in See also:Hungary, and See also:Guanajuato in See also:Mexico. A species separated from freieslebenite by V. von Zepharovich in 1871, because of See also:differences in crystal-See also:line See also:form, is known as diaphorite (from &mope, " difference") ; it is very similar to freieslebenite in See also:appearance and has perhaps the same chemical See also:composition (or possibly Ag2PbSb2S5), but is orthorhombic in See also:crystallization. A third mineral also very similar to freieslebenite in appearance is the orthorhombic andorite, AgPbSbaS6, which is See also:mined as a silver ore at See also:Oruro in ' See also:Bolivia.

End of Article: FREIESLEBENITE

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