Piemontite
Piemontite is a hydrous calcium manganese aluminosilicate found in some regionally metamorphosed rocks. Its formula is (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)
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Piemontite is a hydrous calcium manganese aluminosilicate found in some regionally metamorphosed rocks. Its formula is (CaCa)(AlAlMn3+)O[Si2O7][SiO4](OH)