GLASSY ACTYNOLJTE. Chemical Characters. Before the blowpipe, it melts difficultly into an opaque £reen-coloured glass. Constituent Paris. Glassy Actynolitc from Zillcrthal in the Tyrol. Silica, - - 50.00 Magnesia, - - 19.25 Alumina, - - 0.75 Lime, - 9.75 Potash, - - 0.50 Oxide of Iron, - 11.00 Oxide of Manganese, 0.50 Oxide of Chrome, - 3.00 Carbonic Acid, and "Water, 5.00 Loss,' - - 0.25 Laugier, Annales du Mus. t. v. p. 79. ' Geognoslic and Geographic Situations. Europe.—It occurs in primitive rocks in the isle of Skye: in veins, along with rock-crystal, axinite, and epidote, at Bourg d’Oisans in Dauphiny; in beds of indurated talc, with limestone and common talc, on St Gothard; also in a similar repository in the Zillcrthal, in the Tyrol; and in Sweden. Asia.—It appears to be associated with talc at Bialoy- arsk, in the Uralian Mountains. Observations. 1. It is distinguished from the preceding subspecies by its vitreous lustre, crystallizations, and parallel cross rents. B 2 2. Hauy,