piemontite
Sign in to saveAlso 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
- 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
Wikidata facts
- Subclass of
- epidote mineral group
- Named after
- Piedmont
- Image
- Piemontite -St.Marcel, Aosta.JPG
Show 9 more facts
- crystal system
- monoclinic crystal system
- Nickel-Strunz 9th edition (updated 2009)
- 9.BG.05a
- Commons category
- Piemontite
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 9.BG.05
- Commons gallery
- Piemontite
- streak color
- red
- IMA Mineral Symbol
- Pmt
- chemical formula
- {Ca₂}{Al₂Mn³⁺}(Si₂O₇)(SiO₄)O(OH)
- Strunz 8th edition (series ID, updated)
- VIII/B.15a
Sources (2)
via Wikidata · CC0
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Encyclopedic overview
1 sectionsContents
- References
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.
Excerpted from Wikipedia’s “piemontite” article, available under the CC BY-SA 4.0 licence.