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Formula: CaY4(CO3)7.9H2O
Hydrated normal carbonate, tengerite-(Y) group,
yttrium-bearing mineral
Crystal System: Orthorhombic
Specific gravity: 2.92 calculated
Streak: White
Colour: Snow white
Environments
Lokkaite is a secondary carbonate formed by alteration of
primary rare-earth minerals
(Webmin, HOM).
Localities
At the type locality, the Pyörönmaa pegmatite, Valkeakoski, Pirkanmaa, Finland, lokkaite has been found in fissures in
albite (Dana) associated with
tengerite-(Y)
(HOM).
At Kirigo, Saga Prefecture, Japan, lokkaite has been found in fissures in alkali olivine
basalt (Dana), associated with lanthanite
and kimuraite-(Y)
(HOM).
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