Gypsum

Description
A soft mineral, i.e., natural hydrated calcium sulphate with average moisture content of 1 to 2%, or the rock that consists mainly of this mineral. Insoluble in water. Loaded as fine powder that will aggregate into lumps of up to 100mm. Bulk density: 1,282 - 1,493 kg/m3. Non-IMSBC Code information: used in the production of cement, tiles, plaster and plate glass. Note: common form of gypsum is alabaster. Another form which is transparent is known as moonstone or selenite. In its powdered form, it is known as Plaster of Paris. 
Trade Names (Synonyms)
Alabaster - annaline - calcium (II) sulfate dihydrate - gypsum stone - land plaster - light spar - magnesia white - mineral white - native calcium sulfate - precipitated calcium sulfate - satinite - satin spar - sulphuric acid, calcium (2+) salt, dihydrate - terra alba .

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