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Formula: K2Mg(CO3)2.4H2O
Hydrated normal carbonate
Crystal System: Monoclinic
Specific gravity: 2.01 measured, 2.03 calculated
Hardness: 2 to 3
Streak: White
Colour: Colourless
Solubility: Decomposes in water or a humid environment
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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