Amethyst. *39 Chemical Characters. Lampadius expofed it for four hours to the drong- heat of a wind furnace, when it fuffered no other change but the lofs of its colour, and about one and a garter per cent, of its weight *. According to Eher- ln ann, when expofed to a dream of oxygen gas, it its colour and melts to a tranfparent ball. Constituent Parts. Silica 97)5° Alumina 0,25 Oxyd of iron 0,50 Trace of mangancfe 9 8 > 2 5 Rofe, Kcirjien's Tabeli. f. 23. Geognostic Situation. °. CCUrs ^ om etimes in veins in primitive rocks, and etlmes in agate balls and kidneys in porphyry . r am ygdaloid. The veins in which it occurs are ^ er proper veins, and then it occurs along with the of T 011 w hich it reds, or they are agate veins, w *ch it commonly makes the middle. When it L «npad, Sami. Praft. Chem. Abhandl. b. 1. f. 225. T 2 occurs
