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Mineralpedia Details for Olsacherite

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Olsacherite

Olsacherite

Named in honor of Juan Augusto Olsacher, a former Professor of Mineralogy at Cordoba University in Cordoba, Argentina who studied selenium-rich minerals in Argentina. Olascherite is a rare mineral found in Bolivia, Argentina, and Italy among only a few others. It occurs as a secondary mineral in oxidized selenium-rich hydrothermal deposits. Olascherite is pyroelectric.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/olsacherite.pdf

Formula
Pb2(Se6+O4)(SO4
Crystal System
Orthorhombic 
Crystal Habit
Acicular 
Cleavage
Good, Fair, None 
Luster
Vitreous - Dull 
Color
colorless 
Streak
white 
Class
Orthorhombic - Disphenoidal 
Fracture
Brittle 
Hardness
3-3.5 
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Olsacherite from El Dragón mine, Quijarro, Potosí dept., Bolivia

Olsacherite
            from El Dragón mine, Quijarro, Potosí dept., Bolivia

Fine, very micro needles in white white mattes with minor Chalcomentie (blue) on metallic Krutaite matrix.

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