eskolaite

Eskolaite is a rare chromium oxide mineral (chromium(III) oxide Cr2O3).

Key facts

Mineral.name: Eskolaite
Mineral.image: Eskolaite.jpg
Mineral.imagesize: 260px
Mineral.caption: Eskolaite from Russia
Mineral.category: Oxide mineral
Mineral.formula: Cr2O3
Mineral.IMAsymbol: Esk
Mineral.strunz: 4.CB.05
Mineral.system: Trigonal
Mineral.class: Hexagonal scalenohedral ( m) H-M symbol: ( 2/m)
Mineral.symmetry: Rc, No. 167
Mineral.unit cell: a = 4.95, c = 13.58 [Å]; Z = 6
Mineral.color: Black to dark green
Mineral.habit: Hexagonal prisms and plates
Mineral.cleavage: None
Mineral.tenacity: Brittle
Mineral.mohs: 8 – 8.5
Mineral.luster: Vitreous or metallic

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Wikidata facts

Image: Eskolaite.jpg

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Nickel-Strunz '10th ed', review of (9th ed/ 2009 update): 4.CB.05
Nickel-Strunz 9th edition (updated 2009): 4.CB.05
Commons category: Eskolaite
chemical formula: Cr₂O₃
IMA Mineral Symbol: Esk
Strunz 8th edition (series ID, updated): IV/C.04a

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Article

4 sections

Contents

Discovery and occurrence
Structure and physical properties
See also
References

Eskolaite is a rare chromium oxide mineral (chromium(III) oxide Cr2O3).

==Discovery and occurrence== It was first described in 1958 for an occurrence in the Outokumpu ore deposit of eastern Finland. It occurs in chromium bearing tremolite skarns, metamorphosed quartzites and chlorite bearing veins in Finland; in glacial boulder clays in Ireland and in stream pebbles in the Merume River of Guyana. It has also been recognized as a rare component in chondrite meteorites.