Formula : CaSO4:2H2O

Space group: 
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: A2/a
Dana class: (29) Hydrated Acid and Sulfates (29.6)where A XO4 . x(H2O) (29.6.3) Dana Group
High temperature: 
Stable at room temperature
Geological context: 
Gypsum is one of the more common minerals in sedimentary environments. It is a major rock forming mineral that produces massive beds, usually from precipitation out of highly saline waters. Since it forms easily from saline water, gypsum can have many inclusions of other minerals and even trapped bubbles of gas and water. Occus as a ageing products in mineral waste, slags, MSWI bottom ash, or as secondary product from APC processes.

Dernière mise à jour le 25.01.2021


Reaction properties
T(°C) 0 25 60 100 150 200 250 300
log10K -4.66 -4.60 -4.71 -4.99 -5.48 -6.14 -7.00 -8.22