Perite is a mineral that has a general chemical formula of LeadBismuthOxygen2Chlorine.[ Perite is orthorhombic, space group Cmcm {C2/m 2/c 21/m}. In terms of its optical properties, Perite is anisotropic which means the velocity of light varies depending on direction through the mineral (i.e. it is birefringent). Its calculated relief is 1.45–1.461, which is moderate. It is colorless in plane polarized light, and it is weakly pleochroic. Perite is found in areas near igneous extrusions in places like the Western United States, Southern Australia, and scattered around Europe.
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Crystallography
Perite belongs to the orthorhombic crystal system, and has the properties of 2/m 2/m 2/m crystal class. Therefore, perite has three mirror planes and three twofold rotation axes.
