Chromphyllite

chromphyllite

eskolaite

uvarovite

dravite

Images

Formula: KCr2(AlSi3O10)(OH)2
Phyllosilicate (sheet silicate), mica group, chromium-bearing mineral
Specific gravity: 2.88
Hardness: 3
Streak: Whitish green
Colour: Emerald green
Environments

Metamorphic environments

Localities

At Outokumpu, North Karelia, Finland, chromium-rich micas including chromphyllite are formed by metamorphism at about 3.5 kbar pressure and 600oC (DHZ).

At the type locality, Kaber's pit, Pokhabikha River Valley, Slyudyanka, Lake Baikal area, Irkutsk Oblast, Russia, chromphyllite, which forms a solid solution series with muscovite, occurs as 0.3 to 0.4 mm plates and flakes, commonly rich in chromite and eskolaite inclusions. The chromphyllite occurs in the metamorphic complex, with granulite facies metamorphism, in chromium-enriched layers in quartzite. Associated minerals include muscovite, biotite-phlogopite, uvarovite, chromium-bearing dravite, chromite-zincochromite, eskolaite and, rarely, titanite and rutile (AM 83.652-653, DHZ).

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