Английская Википедия:Eskolaite

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Шаблон:Short description Шаблон:Infobox mineral 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.[1] 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.[2] It has also been recognized as a rare component in chondrite meteorites.[2]

The mineral is named after the Finnish geologist Pentti Eskola (1883–1964).

Structure and physical properties

Файл:Eskolaite-pV.svg
Molar volume vs. pressure at room temperature.

Eskolaite crystallizes with trigonal symmetry in the space group RШаблон:Overlinec and has the lattice parameters a = 4.95 Å and c = 13.58 Å at standard conditions. The unit cell contains six formula units. The lattice is analogous to that of corundum, with Cr3+ replacing Al3+.

See also

References

Шаблон:Reflist


Шаблон:Oxide-mineral-stub

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