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TOPAZ. 53 Geographic Situation. Europe.—It occurs in large crystals, and rolled masses, in an alluvial soil, in primitive country, in the upper parts of Aberdeenshire *; and in veins, along with tin stone, in killas, at St Anne’s in Cornwall. Upon the continent of Europe, it appears most abundantly in to paz-rock at Schneckenstein; also in veins that traverse gneiss, along with tinstone, fluor-spar, and arsenical py rites, at Ehrenfriedersdorff; and in rounded or angular pieces, and sometimes in crystals of a mountain- green co lour, in alluvial soil, at Eibcnstock in Saxony; it also occurs at Zinnwald and Geyer in the same country; at Schlackcnwalde and Zinnwald in Bohemia, it occurs in veins that traverse gneiss, along with tinstone, fluor-spar, copper-pyrites, and lithomarge. It has been found at Hirschberg, and other places in Silesia, and at the Hbl- lengraben, at Werfen in Salzburg, in nests in transition clay-slate. Asia.—It occurs both in the Altain and Uralian moun tains. In the Altain range, it occurs on the banks of the river Tom; and in the mountain Adon-Tschelan, along with beryl, quartz, schorl, fluor-spar, and lithomarge. About twenty-five leagues north of Catharinenburg, in the Uralian range, it is found in considerable quantity in a kind of granite, resembling that variety known under the name of Graphic Granite. There, it is said to occur in drusy cavities, along with rock-crystal and beryl. It D 3 has • Yid. Wernerian Transactions, vol. i. p. 4-5J.
