Gypsum

(noun.) a common white or colorless mineral (hydrated calcium sulphate) used to make cements and plasters (especially plaster of Paris).

克洛伊校对

• The most common impurity is gypsum and it is necessary to remove this gypsum before the salt can be considered pure. 佚名. 神奇的知识之书.
• In about four hours he had found a strong solution of lime in the agate cup, and sulphuric acid in the cup of gypsum. 李贝. 西洋科学史.
• Among other lining materials found suitable were soapstone, alumina, ammonia, copperas, starch, Epsom salts, and gypsum, paper, pulp, and alum, and a mixture of various other materials. 威廉·亨利·杜利特. 世纪发明.

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