Order I. Salia, Salts. To be distinguished by the taste, soluble in water; as rock-salt, alum, borax.
Order II. Sulphura, Sulphureous Minerals. Distinguishable by smell, emitting an odour and flaming under the action of fire, soluble in oil; as amber, naphtha, pyrites.
Order III. Metalla, Metallic Minerals. Distinguishable by good eyes! very heavy, fusible, soluble in appropriate acid menstrua; as molybdæna, lead, gold, and copper.
Class III. Fossilia, Fossils.
Ambiguous stones, originating from modifications of the substances included in the preceding classes.
Order I. Petrificata, Petrifactions. Impressed with the form of some natural object, as,—
Zoolithus, the petrifaction of an animal of the class Mammalia.
Ornitholithus, a petrified bird.
Amphibiolithus, a petrified frog, snake, &c.
Ichthyolithus, a petrified fish.