Schorl. Constituent Parts. Mafiive, Silica 33,33 4° Alumina 40,83 25 Iron 20,41 Lime 15 l^Ianganefe 3,3 3 Osyd of iron 1 ^ withManganefe J 123 Cryfhlliied. 20 2p J 9 97,90 98,0 97,0 tfih. Creiis Beil- Gerhard, Deifen Grand, cinerneii- r *6 e , b 1. 333. en Min. SyJI. tb. i.f- 31*• Phyftcal Charaflers. % heating it exhibits pofitive eieftricify at one ex- etT) hy, and negative at the other. Wiedenman re- j^ r ks that when it begins to cool, the pofitive end ec °mes negative, and the negative pofitive. Get gnostic Situation. a nd ° CCUrs * n Primitive rocks, principally in quart2 Ul ^ ra ^ lte » w ith the former it conllitutes a peculiar Un tain rock*. It is found feldomcr in gneufs, and * Tk that > ° natl,ra ^ ^ l *ftory of the fchorl rock will be detailed in l rt °f this work which treats on mincralogical geography. R 2 it'il 1
