piemontite
Sign in to savePiemontite 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
- Mineral.cleavage
- [001] good, [100] distinct
- Mineral.fracture
- Uneven to splintery
- Mineral.tenacity
- Brittle
- Mineral.mohs
- 6 – 6.5
- Mineral.luster
- Vitreous
- Mineral.refractive
- nα = 1.725 – 1.756 nβ = 1.730 – 1.789 nγ = 1.750 – 1.832
via Wikipedia infobox
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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.