470 TALC GENUS. Geognostic Situation. It is found principally in primitive mountains, and is there ufuclly imbedded in limeftone. It has been alfo found in rocks belonging to the floetz trap for mation, accompanied with prehnite. Geographic Situation. It has been hitherto found in the greatefl beauty and quantity in the mountains of Tremola, in the vi cinity of St Gothard dn Switzerland ; alio in Tran- filvania ; the Tyrol; Carinthia ; Bannat of Temef- war; Moravia; in the limeflone quariies of Langen- feld in the electorate of Saxony; in the Shetland iflands, near Beith in Ayrlhire, and in the bafaUic rock on which the caftle of Edinburgh is built. Obfervation. Aflynolite and ttemolite are nearly allied ; one of the mofl characterillic diltinCtions is the green co lour, which is chara&eriftic of aclynolite, but is rare' apd only very faint in tremolite. Werner remarks that tremolite is related to aclynolite in the fams manner as leuzite is to garnet. SIXTH