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Formula: K3Na(UO2)(CO3)3.H2O
Hydrated carbonate, uranyl mineral
Crystal system: Hexagonal
Specific gravity: 3.30 measured on synthetic material, 3.27 calculated
Hardness: 2 to 2½
Streak: Light yellow
Colour: Yellow
RADIOACTIVE
Environments
Localities
At the Rovnost Mine, Jáchymov, Karlovy Vary District, Karlovy Vary Region, Czech Republic, grimselite has been
found with čejkaite
(Mindat photo).
Grimselite from the Rovnost Mine - Image
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).
Grimselite from the Gerstenegg-Sommerloch tunnel -
Image
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