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EMEKTLITE. 657 green when first broken from the rock, but hardens afterwards and becomes black. G = 2'02. Infusible. Is decomposed by hydrochloric acid. Contains silica, iron and a little alumina. Is found imbedded in the amygdaloidal rock of the cliff of Scuirmore in the island of Bum, and in Fife. The chlorophseite of Forchammer is probably a different substance. CHONIKItlTE. — Fracture uneven, and imperfect con- choidal. Translucent...translucent on the edges. Dull or slightly glimmering. "White, yellowish-white, greyish-white. Sectile. h = 3 - 0. G = 2'0l. Before the blowpipe melts easily with ebullition into a greyish glass. With borax fuses slowly into a globule coloured by iron. Is completely decom posed by concentrated hydrochloric acid. Analysis by v. Ko- bell— silica 35 - 69, alumina 17'12, magnesia 22-60, lime 12-60, protoxide of iron l'-ia, water 9'00. Is found with pyrosklerite near Porto Ferrajo in Elba. i CIMOL1TE.—Earthy, slaty. White, grey. g = 2-277. Analysis by Khretschatitzki silica 63 63, alumina 23 70, water 12-42. Is found in ltussia and in the island of Argentiera. DIPIIANITE.— In hexagonal prisms having a very per fect cleavage perpendicular to the axis of the prism. Trans parent... translucent. Lustre vitreous. Blueish when viewed in a direction parallel to the cleavage, white in a direction per pendicular to the cleavage. II = 5. G = 3"05. Analysis by v. Jewreinoft':—silica 34'02, alumina 43’33, lime 13’11, protoxide of iron 3'02, protoxide of manganese l'os, water 6 - 34. Is found with phenakite and chrysoberyl in the emerald mines of the Ural. EMEBYLITE.—(Smith. Silliman’s Joum. 1849. 7. 285.) Cleavage in one direction very perfect. White...grey, with a tinge of lilac. Brittle and inelastic, ii = 3'5. g = 2-995. In the matrass yields water and traces of fluorine. Before the blowpipe exfoliates, emits a strong light and fuses on the edges of thin lamina;. Dissolves in borax forming a clear glass. Leaves a skeleton of silica in salt of phosphorus. Is not acted upon by acids. Analysis of emerylite from Aston by Crawe :— silica 32-31, alumina 49 24, lime 10-66, magnesia 0 30, potash and soda 2-22, water 5 - 27. Is found in brilliant micaceous scales associated with the emery from Asia Minor, and with corundum at Aston, Chester County, Pennsylvania.