Images
Formula: Ba2CaMgAl2F14
Fluoride, barium-bearing mineral
Crystal System: Monoclinic
Specific gravity: 4.26 calculated
Hardness: 3#189;
Streak: White
Colour: Brown to dark brown, yellow, white, colourless
Luminescence: No fluorescence under UV
Solubility: Dissolves when heated in concentrated hydrochloric, nitric or sulphuric acid
Magnetism: Diamagnetic
Environments
Localities
At the type locality, Fluorite vein, Parvaya Noiba River, Enisei Range, Krasnoyarsk Krai, Russia, usovite occurs
intergrown with green and colourless fluorite. It is mainly in irregular
grains, 0.5 to 3.0 mm, sometime as indistanct elongated platy forms up to 1.5 x 0.5 cm
(AM 52.1582).
It occurs in the fluorite vein in
quartz-mica
schists, associated with
fluorite, calcjarlite,
muscovite, thorite,
chamosite, zeolites and
halloysite
(HOM).
Usovite from the Parvaya Noiba River -
Image
Back to Minerals