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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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