piemontite
Also known as piedmontite
Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula . It is a member of the epidote group.
Key facts
- Mineral.name
- Piemontite
- Mineral.category
- SorosilicatesEpidote
- Mineral.image
- Piémontite.jpg
- Mineral.imagesize
- 275px
- Mineral.caption
- Piémontite from the type locality: Prabornaz Mine, Italy
- Mineral.IMAsymbol
- Pmt
- Mineral.system
- Monoclinic
- Mineral.class
- Prismatic (2/m) (same H-M symbol)
- Mineral.symmetry
- P21/m
- Mineral.color
- Reddish-brown, reddish-black
- Mineral.habit
- Slender prismatic, blocky to massive
- Mineral.twinning
- On [100] uncommon
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Article
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Piemontite is a sorosilicate mineral in the monoclinic crystal system with the chemical formula . 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.