Baylissite

minerals

grimselite

schrockingerite

monohydrocalcite

Formula: K2Mg(CO3)2.4H2O
Hydrated normal carbonate
Specific gravity: 2.01
Hardness: 2 to 3
Streak: White
Colour: Colourless
Solubility: Decomposes in water or a humid environment
Environments

Plutonic igneous environments

Localities

At the type locality, the Gerstenegg-Sommerloch tunnel, Gerstenegg, Guttannen, Interlaken-Oberhasli, Bern, Switzerland, baylissite occurs as a secondary mineral in fractures in aplite-granite and granodiorite. Associated minerals include quartz, feldspar, grimselite, schröckingerite, calcite and monohydrocalcite (HOM, Dana).

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