Hydrated normal carbonate, tengerite-(Y) group
Specific gravity: 2.92
Colour: Snow white
Lokkaite is a secondary carbonate formed by alteration of
primary rare-earth minerals
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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