Call number:
C18
Classification:
Minerals from the Lavrion Mines
Translated title:
Barite and Gypsum
Place of origin:
Plaka / Lavrion, Greece
Depositional environment:
Barite: Sedimentary rocks and late gangue mineral in ore veins. Commonly found as a gangue mineral in metallic ore deposits of epithermal or mesothermal origin; but it may also be found as lenses or replacement deposits in sedimentary rocks, both of hypogene and supergene origin. Gypsum: Sedimentary evaporite deposits.Commonest of the sulphate minerals, gypsum is found in marine evaporites, in caves where the air is dry enough to allow it to be deposited and remain, at fumaroles, and in the oxidized zones of sulfide deposits on occasion.
Description:
Barite: Sedimentary rocks and late gangue mineral in ore veins. Commonly found as a gangue mineral in metallic ore deposits of epithermal or mesothermal origin; but it may also be found as lenses or replacement deposits in sedimentary rocks, both of hypogene and supergene origin. Gypsum: Sedimentary evaporite deposits.Commonest of the sulphate minerals, gypsum is found in marine evaporites, in caves where the air is dry enough to allow it to be deposited and remain, at fumaroles, and in the oxidized zones of sulfide deposits on occasion.
Chemical formula:
BaSO4 and CaSO4*2H2O
Crystal system:
Orthorhombic and Monoclinic
Crystal schema:
Dipyramidal and Prismatic
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