EARTHS.' SILICEOUS. 53, 54. 
5J. CFILOROGRANATUS. Confifting of filica, 
a large proportion of oxyde of iron, and car- 
bonate of lime, with frequently alumina ; hard, 
never opake or fubopake, cryftallized : eafil/ 
fufible in the fire. 
Green, becoming honey-yellow in a white heat. 
If^eigleb. Chein, atinal, 1788. \.p. 2CO. 
1. In double 8-fidcd. pyramids, augmented at each peint by 
another 3-fided pyramid. 
2. In 6-riaed prifms, terminating each fide in a 3.1ided py- 
ramid. 
Found in Bohemia near Lichte--u.'alleliein, in Saxotf^ near Ehrert' 
friedeffdorf, Breiteetbrunn, Eibeiiliock, and SchviaHxenhurg't 
and in Franconia near Ilmenau on mount Ehrtnburg: co- 
lour from leek to olive-green, fometimes diaphanous, foine- 
times pellucid, and often forms entire llrata with layers or 
clay : frequently contains a fourth part of iron, and is ufed 
as a flux in iron furnaces : fpecific gravity from 3754. 
3757 - 
Red, cubic. 
Wedrumb Chem, annul, 1789' P- &C. 
Found — contains about a fifth part of carbonate of lim® 
impregnated with carbonic acid gas, and about a tenth part 
of iron : cryftals fmall, aggregate, feated on friable fand- 
Ifone : may probably not belong to this genus. 
54, ARENA. Confifting of comminuted filiceous 
ftones : rough, hard, dry, in minute diftinft 
granulations, not penetrable by water: not fn- 
fible per fe, ’ but melting with foda into glafs. 
A. Originating from comminuted Flint-Jisnes. 
Compofed of fragments of flint. 
Arena filicea. Evft. nat. xii. .3. f. 199. n. 1 4. 
Found in Buchngbamjhire and other places, 
