58 A SYSTEM OF 



a. Uncoloured and clear, Diaphcnum. 



Is found in the copper mines in the 



north part of Norway, and in Siberia. 



This has no criftallifed form, but is ne- 



verthelefs as clear as quartz criftals of 



the beft water. 

 fa White, the common fat quartz. 



c. Blue, from the ifland of Uto in the 

 province of Sodermanland. 



d. Violet, from the ifland of Uto. 



B. Grained, Textura granulata. 



a. White, from the gold mines at Adel- 

 fors in the province of Smoland, and 

 the copper mines at Lovifeberg in Weft- 

 manland. 



fa Pale green, from Adelfors. 



C. Sparry quartz, Textura fpatofa. 



This is the fcarceft, and ought not to 

 be confounded with the white Felt-fpat 

 Seel:, lxvi. being of a fmoother appear- 

 ance, and breaking into larger and more 

 irregular planes. 

 en. Whitifh yellow, from the gold mines 



in Hungary. 

 fa White, from the ifland of Uto. 



SECT. LIL 



D. Criftallifed Quartz, ghiarzum crifiallifa- 

 tum. Rock criftal. Quartz criftal. Crif- 

 t alius montanus. 



Its figure is already (Sect. 1.) defcrib- 

 ed, and, in regard to the colours, the fol- 

 lowing varieties occur. 

 i. Opaque, or femi-tranfparent, Crift alius 



cpacus vcl femi-diaphanus. 



a. White, or of a milk colour. 



£Red 



