Excerpt from A General System of Nature, Through the Three Grand Kingdoms of Animals, Vegetables, and Minerals, Vol. 7 of 7: Systematically Divided Into Several Classes, Orders, Genera, Species and Varieties, With Their Habitations, Manners, Economy, Structure, and Peculiarities
Vitriol, the produe't of alum, intimately allied to metal, is of different appearance and figure according'to the nature of the me tal, of which the molt frequent are Iron, Coppbr, and Zinc; fome therefore molt commonly become fnlphureous Pyrites, others terrene Ochres. Different Pyrites aliiune 'different figures, whofe earth into which it is refolved is ufinally denominated Ochre, which when proceeding from Iron is yellow, and becomes red when burnt when from Copper by acid is green, by alcali blue: fo that {tones which are yellow or red, are pincipally from Iron; thole which are green or blue, from Copper. Each kind of Ochre, by cryltallization, coagulates earths into Tophs.
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