60 SCHORL FAMILV-. Constituent Parts. Silica, 30. Alumina, 60. Fluoric acid, 6. Lime, 2. Iron and man- 34. 48. 17. 43. 49.5 4. ganese, 1. Loss, 1. Water, 1. Oxide of iron, 1. 1. 1. 1.5 100. 100. 100. Vauquelin, in Brong- Sticholz, in Gehlcn’s Klaproth, in Karsten’e It occurs in a rock composed of quartz and mica, at Altenberg in Saxony. The rock forms a bed several fa thoms thick, and of unknown extent. Werner is of opi nion that this schorlite rock is subordinate to mica-slate; but Haberle is inclined to place it in the system between gneiss and mica-slate. Its true position is still undeter mined. At Schlackenwald in Bohemia, it is imbedded in an aggregate of quartz, tinstone, wolfram, and mo. lybdena. In Siberia it occurs along with mica and quartz ; and is at Mauleon in France imbedded in stea tite. 1. Distinctive Characters.—a. Between schorlite and beryl. The colour-suite of beryl is different from that of schorlite; mart’s Mineralogie, Journ. ii. 38. i. 419. TabeU. Geognostic and Geographic Situations. Observations.