Lokkaite-(Y)

minerals

tengerite-(Y)

lanthanite

kimuraite

Formula: CaY4(CO3)7.9H2O
Hydrated normal carbonate, tengerite-(Y) group
Specific gravity: 2.92
Streak: White
Colour: Snow white
Environments

Pegmatites

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).

Back to Minerals