of commerce is variously kaolin, gypsum, burnt alum, or magnesia, but the term should be reserved for kaolin.
A native form of finegrained gypsum or calcium sulphate CaSOJ, ued in sculpture and for ornamental applications.
Uranium minerals, one of which is a phosphate of uranium and copper, and the other a phosphate of uranium and calcium.
A peculiar variety of clay found in Dorsetshire and Devonshire, used for making tobacco pipes and certain kinds of pottery.
is distilled from the grass of a species of Andropogon, somewhat resembling geranium oil in character, and is used in perfumery.
A weak basic body occurring in muscular flesh and nearly related to xanthine. Both substances are chemically related to uric acid.
The produce of the Acacia mimosa, containing an astringent principle used in tanning and resembling cutch in character and composition.
Compounds of oxalic acid with metals and bases. The alkaline oxalates are soluble in water, but the others are for the most part insoluble.
are red and orange, and are extracted from the wood of the Cesalpina crispa by boiling water. They are used for dyeing articles of silk and wool.
A blue basic copper carbonate 2 found in the native state at Chessy, near Lyons, the United States of America, and elsewhere also known as chcssylite.