Kalpana Kalpana (Editor)

Piemontite

Updated on
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Covid-19
Category  Sorosilicates Epidote
Space group  P21/m
Crystal system  Monoclinic
Piemontite
Formula (repeating unit)  Ca2(Al,Mn,Fe)3(SiO4)(Si2O7)O(OH)
Crystal class  Prismatic (2/m) (same H-M symbol)
Colour  Reddish-brown, reddish-black

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 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.

References

Piemontite Wikipedia


Similar Topics
All a Bir r r d
Mark Bonney
Ben Perowsky
Topics
 
B
i
Link
H2
L