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Formula: SrCaAlF7
Fluoride of strontium, calcium and
aluminium
Crystal System: Monoclinic
Specific gravity: 3.06 to 3.11 measured, 3.206 calculated
Streak: White
Common impurities: Na
Environments
Although karasugite was approved in 1993, to date (August 2026) it has been reported only from the type
locality.
Localities
At the type locality, Karasug REE-Sr-Ba-Fe-fluorite deposit, Chaa-Kholsky District, Tuva, Russia, karasugite
occurs as a secondary mineral formed in fissures in the
oxidation zone of veins of iron ores in tectonic breccias.
Associated minerals include gearksutite,
tikhonenkovite, fluorite,
barium-bearing celestine,
limonite, hematite and
quartz
(HOM).
Karasugite occurs as colourless rosettes to 1.5 x 1.5 x 1.0 mm3, consisting of bladed crystals
to 0.25 x 0.10 x 0.003 mm3
(Mindat).
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