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Mineralati

Minerals

Piemontite

piemontite

{Ca2}{Al2Mn³⁺}(Si2O7)(SiO4)O(OH)

Piemontite Mineral Specimen For Sale

Piemontite Mineral Specimen For Sale — via www.dakotamatrix.com · Source

Overview

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 color, piemontite has a red streak and a vitreous lustre. Manganese (Mn3+) causes the red color. The type locality is the Prabornaz 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.

Scientific references

  1. Piemontite — Wikidata. https://www.wikidata.org/wiki/Q425187 Link
  2. Piemontite — Wikipedia. https://en.wikipedia.org/wiki/Piemontite Link