penroseite
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Penroseite is a rare selenide mineral with formula (Ni,Co,Cu)Se2. It has a gray-steel color and black streak with a hardness of 3. It is an isometric mineral, 2/m. Penroseite was first discovered in 1925 in a Bolivian rhyolite. It was named for Richard Penrose (1863–1931), an economic geologist.
Wikidata facts
- Image
- Penroseite-217412.jpg
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- Strunz 8th edition (series ID, updated)
- II/C.05
- IMA Mineral Symbol
- Pen
- chemical formula
- NiSe₂
- Nickel-Strunz 9th edition (updated 2009)
- 2.EB.05a
- Nickel-Strunz '10th ed', review of (9th ed/ 2009 update)
- 2.EB.05a
- Commons category
- Penroseite
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~6 min read
Article
5 sectionsContents
- Composition
- Physical properties
- Geologic occurrence
- Structure
- References
{{Infobox mineral | name = Penroseite | category = Selenide minerals, pyrite group | boxwidth = | boxbgcolor = | image = Penroseite-217412.jpg | imagesize = | caption = Penroseite from Pakajake Canyon, Chayanta Province, Potosí Department, Bolivia | formula = (Ni,Co,Cu)Se2 | IMAsymbol = Pen | molweight = | strunz = 2.EB.05a | dana = 02.12.01.04 | system = isometric | class = Diploidal (m) H-M symbol: (2/m ) | symmetry = Pa | color = Steel gray | habit = Radial, columnar, reniform | cleavage = {001} Perfect, {011} Distinct | fracture = Subconchoidal | tenacity = Brittle | mohs = 2.5 - 3 | luster = Metallic | diaphaneity = Opaque | pleochroism = | streak = Black | gravity = 6.58-6.74 | references = }}
Penroseite is a rare selenide mineral with formula (Ni,Co,Cu)Se2. It has a gray-steel color and black streak with a hardness of 3. It is an isometric mineral, 2/m. Penroseite was first discovered in 1925 in a Bolivian rhyolite. It was named for Richard Penrose (1863–1931), an economic geologist.