mineralogy; 
h. Red, or of a carnelian colour, from 
Oran in Barbary. 
c. Black, from the fame placet 
2. Clear, Diaphanus, 
a, Blackiih brown, fmoaky topaz, of 
Raunch ^opas of the Germans, is 
found at Egern in Norway, and at 
Lovifa in Finland, 
h. Yellow, found in Bohemia, and fold 
inftead of topazes. 
c, Violet, the amethift, 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 inftance Topaz-Flufs, hr 
methift-Flufs, &c. &c. 
SECT. LIII. 
. Impure Quartz, ^artzum heterogeneis in- 
time mixtum, 
A> Mixed with iron, in form of a black calx, 
^artzum calce ferri atro intrinfece mixtum. 
This is black, of a glofly texture, and 
contains a great quantity of iron. 
It is found at Staffs' iron mine in So- 
dermanland, and at Gierdelioftrand in the 
pariih of Offerdal in Jemtland, at which 
laft place the iron alfo difcovers itfelf by 
Its ruft in the cracks of the Hone, 
B. Mixed with copper in form of a red 
calx, 'Sluartzum ctqco Veneris mixtum. 
Red 
