gypsum
Noun
Meaning
A mineral consisting of the hydrous sulphate of lime (calcium). When calcined, it forms plaster of Paris. Selenite is a transparent, crystalline variety; alabaster, a fine, white, massive variety.
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Examples
Acids in the rain react with the calcium compounds in the stones to create gypsum, which then flakes off.
Alabaster or mineral gypsum is a soft mineral that is easy to carve for smaller works and still relatively durable.
Although traditionally composed of natural chalk, modern blackboard chalk is generally made from the mineral gypsum ( calcium sulfate ), often supplied in sticks of compressed powder about 10 cm (4 in) long.
Another method specified by Chinese texts—the earliest dating to 1110—specified the use of saponin (from the beans of Gleditschia sinensis) to extract hormones, but gypsum (containing calcium sulfate ) was also known to have been used.
Because gypsum dissolves over time in water, gypsum is rarely found in the form of sand.
A scam has been unearthed at Dangote Cement in Masaiti district where supply of raw materials especially gypsum is being quoted in dollars.