Piemontite
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Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Template:Chem2.[1] It is a member of the epidote group.[2]
Red to reddish-brown or red-black in color, piemontite has a red streak and a vitreous lustre.[2] Manganese (Mn3+) causes the red color.[3]
The type locality is the Prabornaz Mine, in Saint-Marcel, Aosta Valley, Italy.[2]
It occurs metamorphic rocks of the greenschist to amphibolite metamorphic facies and in low-temperature hydrothermal veins in altered volcanic rocks. It also occurs in metasomatized deposits of manganese ore. Associated minerals include: epidote, tremolite, glaucophane, orthoclase, quartz and calcite.[1]
References
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