Chromceladonite

chromceladonite

Images

Formula: KMgCr(Si4O10)(OH)2
Phyllosilicate, celadonite subgroup, dioctahedral mica group, mica group, chromium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 2.90 measured, 2.95 calculated
Hardness: 1 to 2
Streak: Pale green
Colour: Emerald-green
Luminescence: Not fluorescent
Environments

Metamorphic environments
Hydrothermal environments

Localities

At the type locality, the Srednyaya Padma mine, Zaonezhie peninsula, Medvezhyegorsky District, Republic of Karelia, Russia, chromceladonite occurs in a metasomatic rock in the uranium-vanadium deposit. Associated minerals include dolomite, quartz, roscoelite, chromphyllite, calcite, hematite, uraninite, zincochromite and vanadium oxides. The chromceladonite occurs as aggregates of thin lamellae up to 1 cm, and as spherulites and veinlets. It is transparent with a vitreous to silky lustre (CM 40.3.1001–1020).
Chromceladonite from the Srednyaya Padma Mine - Image

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