Tengerite-(Y)

carbonate

rare-earth

Formula: Y2(CO3)3.2-3H2O
Hydrated normal carbonate
Specific gravity: 3.110 (calculated)
Streak: White
Colour: White
Environments

Pegmatites

Tengerite-(Y) occurs as an alteration coating on yttrium-bearing minerals such as gadolinite (Webmin, HOM). Associated minerals include gadolinite-(Y), lokkaite-(Y), kimuraite-(Y), iimoriite-(Y), keiviite-(Y), bastnäsite-(Ce), thalénite-(Y), lanthanite, synchysite, calcite and quartz (HOM, Mindat).

At the type locality, Ytterby, Resarö, Vaxholm, Stockholm, Sweden, tengerite-(Y) occurs in a rare-earth-rich granite pegmatite (Mindat).

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