A SYSTEM OF 
1. Tranfparent, from the Eaftern coun? 
tries. 
2. Opaque. 
SECT. XVI. 
. E. Gypfam of a fcaled or granulated flruftiirCj 
Gypfumparticulis micaceis. This is the com- 
mon Plafler-ftone. 
1. With coarfe fcales. - 
a. V/hite, is found in the copper-mines 
of Ardal' in Norway, where this flonc 
is the country for the copper-ores. 
2. AVith fmail fcales. 
a. Yellowifh, from Montmartre near Paris. 
b. Greyifh, from Speremberg in the Mark, 
in Germany. 
SECT. XVII. 
C Fibrous Plafter-ftone, impro- 
perly (thougli' commonly) called Englifli 
Talc by our a>^ggilts, Gypfum fibrofum^ 
.Alcihajirties, 
j. With the fibres coarf^, 
a. White, from Livoni^v 
2 . With fine fibres. 
. a. White, is found in very t.hm ftrata in 
the alum rock at Andrarum 3Q the pro- 
yince of Skone. 
SECT. XVIII. 
J5. Spar like Gypfum, Gypfum fpatofum, Se« 
■ lenites. This by fome is alio called Glades 
Marl£^ and is confounded with the clear and 
transparent Mica, Mica alba pellucida (Sect. 
Kciy.). 
