( 568 ) ORDER XXI I-—CERIUM. r l ms Order contains two species, viz. Cerite and AI- lanite. 1. Cerite. Bastnas Tungsten, Cronsledt, (first description), in the Abh. A. Schwed. Akad. 1751, s. 235.—Cerit, Hisinger ^ Berzelius, S. Cerium en ny metall, funnen i Bastnas Tungsten frau Rid- darhyttan i Westmannland, AC Hisinger & Berzelius, Stock holm, 1804, 8.—Cerit, Hisinger # Berzelius, in Afh. i Fys. Kem. och Mm. I. 58. Id. Leonhard, Tabel. s. 83. Id. Kar- slen, label, s. 74.—Cerium oxyde silicifere, Hauy, Tabl. p. 120.—Cerite, Aikin, p. 72. External Characters. Its colour is intermediate between crimson-red, clove- brown, and reddish brown ; also dark or pale flesh-red, and very rarely inclines to yellow. It occurs massive, and disseminated. Internally R ; s glimmering and resinous. .The fracture is fine splintery. The fragments are indeterminate angular, and not particularly sharp-edged. It is opaque. It scratches glass with difficulty, and affords few sparks with steel. Its streak is greyish-white. It