tYTHRODES. 423 • 4. Lythrodes. Lythrodes, Karsten. id. Karsten, in Gesel. Naturforsh. Frcunde zu Beilin Magazifi, 1810, p. 78.—Thomson's Annals, i. p. 111. External Characters. Its colour is aurora-red, passing into brownish-red; and sometimes through flesh-red into yellowish-brown ; and it is occasionally marked with cream-yellow, and greenish spots. It occurs massive and disseminated. In the principal fracture, the lustre is resinous and glimmering; in the cross fracture dull. The principal fracture is concealed foliated ; the cross fracture splintery. It is feebly translucent on the edges. It is semi-hard in a high degree. Specific gravity, 2.510, John. Constituent Parts. Silica, - 44.62 Alumina, - 37.36 Lime, - 2.75 Soda, - 8.00 Water, - - - 6.00 Oxide of Iron, 1.00 Loss, - 0.27 100 ' John, Chem. Unters. p. 171. T> d 4 Geographic
