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62 CHRYSOLITE FAMILY. common garnet has a specific gravity of 3.75, coccolite of 3.33.—b. Between Coccolite and Common Augite: The colour-suites of the two minerals are different; the lustre of common augite is resinous, that of coccolite is vitreous; in common augite the distinct concretions are grown to gether, whereas they are so loosely aggregated in cocco lite, as frequently to be separable by the mere pressure of the fingers; coccolite is rather softer than augite; and the concretions in coccolite are frequently enveloped in an ex tremely delicate crust, which is not the case with com mon augite. 2. It was first described by D’Andrada, under its pre sent name. Diopsidc. Diopsid, Werner. Cristaux gris-verdatres, transparens; formes tres prononces, du ^ Depart, du Po; Alalile de Bonvoisin, Journal de Physique, Mai 1806, p. 409. &c.—Varicte du Diopside, Journal des Mines, n. 115. p. 65. &c.—Cristaux gris-verdatrcs, ou blancs grisatres, offrant la forme primitive pcu prononre, de Depart, du Po , Mussite de Bonvoisin, Journal de Physique, ib.— Varicte du Diopside, Journal des Mines, ib.—Pyroxene; also Pyroxene cylindroide, comprime, et fibro-granulairc, Hauy, Tabl. p. 41, 42—Diopsid, Steffens, b. i. s. 349. Id. Hoff'. b. i. s. 467- Id. Lenz, b. i. s. 212.—Strahliger Pyroxen, Oken, b. i. s. 335. External Characters. Its colour is greenish-white, slightly inclining to grey; also pale mountain-green, and emerald-green. It