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Formula: K3Na(UO2)(CO3)3.H2O
Hydrated normal carbonate
Specific gravity: 3.3
Hardness: 2 to 2½
Streak: Light yellow
Colour: Yellow
Solubility:
Common impurities:
RADIOACTIVE
Environments
Localities
At the type locality, the Gerstenegg-Sommerloch tunnel, Gerstenegg, Guttannen, Interlaken-Oberhasli, Bern, Switzerland,
grimselite is a secondary mineral occurring as crusts of
fine-grained
aggregates where granodiorite and
aplite granite are cut by
fissure veins and mineralised zones. Associated minerals include
schröckingerite, baylissite,
calcite and monohydrocalcite
(AM 58.139, HOM).
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