Piemontite Red 4.80 ct

Piemontite  Red ピエモンタイト 4.80 ct Italy Trillion Cut 11.60 x 11.40 x 7.35 mm max6902

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.