MINERALOGY & 



b. Red, or of a carnelian colour, from 

 Oran in Barbary. 



c. Black, from the fame place, 

 2. Clear, Diaphanus. 



a. Blackifh brown, fmoaky topaz, or 

 Rauncb Topas of the Germans, is 

 found at Egern in Norway, and at 

 Lovifa in Finland. 



b. Yellow, found in Bohemia, and fold 

 inflead of topazes. 



c. Violet, the amethifl, from Saxony, 

 Bohemia, and Dannemora in Up- 

 land. 



d. Uncoloured, Rock Criftal, properly 

 fo called, from Bohemia : alfo from 

 the province of Jemtland, and many 

 other places ; when thefe coloured 

 criftals are not clear, they are called 

 Flufs, for infbance Topaz-Flufs, A- 

 methift-Flufs, &c. &c. 



SECT. LIII. 



2. Impure Quartz, guartzum heterogeneis in- 

 time mix turn. 



A* Mixed with iron, in form of a black calx, 

 Quartznm cake ferri atro intrinfece mix turn. 

 This is black, of a gloffy texture, and 

 contains a great quantity -of iron. 



It is found at Staf Y iron mine in So- 

 dermanland, and at Gierdefioftrand in the 

 parifh of Offerdal in Jemtland, at which 

 laft place the iron alfo difcovers itfelf by 

 its ruft in the cracks of the ftone. 

 B. Mixed with copper in form of a red 

 calx, Shtartzum croco Veneris mixtum. 



Red 



