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Formula: K2Ca(SO4)2.H2O
Hydrated normal sulphate
Crystal System: Monoclinic
Specific gravity: 2.579 to 2.603 measured, 2.597 calculated
Hardness: 2½
Streak: White
Colour: Colourless, white, light yellow, colourless in transmitted light
Solubility: Does not alter in dry air, partially dissolves in water with separation of gypsum
Environments
Evaporite deposits
Cave deposits
Sublimates
Syngenite is an uncommon diagenetic component of marine salt deposits, a volcanic sublimate or pneumatolytic
reaction product, a hydrothermal vein filling in a geothermal field, or derived from bat guano in caves.
Associated minerals include halite and
arcanite in salt deposits, and
biphosphammite, aphthitalite,
monetite, whitlockite,
uricite, brushite and
gypsum in caves
(HOM).
Localities
At the type locality, the Kalusa salt deposit, Ivano-Frankivsk Oblast, Ukraine, syngenite occurs in druses in
halite
(Mindat).
Syngenite from Kalusa - Image
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