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Formula: Ba2La(CO3)3F
Anhydrous carbonate of barium and
lanthanum
Crystal System: Monoclinic
Specific gravity: 4.65 measured
Hardness: 4
Streak: White
Colour: Colourless to white, pale green
Luminescence: No fluorescence under UV
Environments
Pegmatites
Hydrothermal environments
Although kukharenkoite-(La) was approved in 2002, to date (May 2023) it has been reported only from the type
locality.
Localities
At the type locality, the Hilairitovoye pegmatite, Kirovskii apatite mine, Kukisvumchorr Mt, Khibiny Massif, Murmansk
Oblast, Russia, kukharenkoite-(La) occurs as a late hydrothermal mineral in cavities in
pegmatite veins cutting an alkaline igneous complex. It is
found as white, pale green or colourless crystals, flattened prismatic to acicular and up to 0.5 mm long. It occurs in
two different pegmatite veins. In one vein associated minerals
include
microcline, albite,
calcite, nenadkevichite,
hilairite, catapleiite,
strontianite,
donnayite-(Y),
synchysite-(Ce) and pyrite.
In the other vein, a
pectolite–aegirine–microcline
vein, associated minerals include natrolite,
calcite and neodymian
ewaldite
(CM 42.921-945).
Kukharenkoite-(La) from the Kirovskii
apatite mine - Image
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