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#6831
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Piemontite 3.09 ct.
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Piemontite
Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula Ca2(Al,Mn3+,Fe3+)3(SiO4)(Si2O7)O(OH). It is a member of the epidote group.
Red to reddish-brown or red-black in colour, Piemontite has a red streak and a vitreous lustre.
The type locality is the Praborna Mine, in Saint-Marcel, Aosta Valley, Italy.
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.The hardness is 6-6.5.
Size: 6.9x10.4x5.1 mm.
Weight: 3.09 ct.
CODE#6831
Origin | Italy |