MODE I. AUARTZ. 147 



white quartz: per Laxman, 1 Chy. An. 1785, 

 265. Also Flinzberg, in Lusatia, almost entirely. 

 2 Berg. Jour. 1789, 1054. There is also an ex- 

 tensive narrow ridge of quartz, some miles long, 

 in Bavaria. 2 Berg. Jour. 1790, 529, &c. Hurl 

 Bavaria, 309. Monnet mentions a rock of quartz 

 60 feet high. 17 Roz. 163. Mountains of it also 

 occur in Thuringia. Voigt Prack. 69. and in Si- 

 lesia. Gerh. Beytr. 87. and in Saxony. 1 Berg. 

 Jour. 1788, 269. and in layers between gneiss 

 and slate mica. 2 Lenz. Also in Scotland. 2 

 Wms. 52. It is not metalliferous. Werner Kurse 

 Classif. 15. Petrol is often found in it. 1 Berg. 

 Jour. 1 79 1 , 91. The mountain of S wetlaia Gora, 

 among the Uralian, consists of round grains of 

 quartz, white and transparent, and of the size of 

 apea^ united without any cement. 2 Herm. 278*." 

 Mountains of quartz also occur in Scotland, 

 where, from the white substance, they sometimes 

 appear as if covered with snow. A hill of this 

 kind is seen near Cullen, which supplies glass- 

 works at Newcastle with quartz. The mountains 

 of Scuraben and Morven, in Caithness, are chiefly 

 constituted of this substance ; which also, accord- 

 ing to Mr. Jameson, occurs in great quantity in 

 the islands of Hay, Jura, and Coll. There are 

 also large rocks of quartz in Upper Lorn. Buf- 



* Kirvvan Geol. Ess. 179. 



