Syngenite

syngenite

biphosphammite

aphthitalite

brushite

Images

Formula: K2Ca(SO4)2.H2O
Hydrated normal sulphate
Specific gravity: 2.579 to 2.603
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).

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