468 
Class I. 
Order I. 
SIMPLE STONES. 
Sp. 12. Petrilite *. 
Cubic felspar. 
This stone is found in the mass of mountains. It is 
amorphous. Texture foliated. Fracture splintery. Frag 
ments cubic, or inclining to that form ; their faces un 
polished. Lustre 2. Transparency partly 2, partly 1. 
Hardness 9. Specific gravity, 3.081. Colour reddish 
brown. Does not melt at 160° Wedgewood. 
Sp. 13. Felsite f. 
Compact felspar. 
This stone also forms a part of many mountains, and 
is amorphous. Texture somewhat foliated. Fracture 
uneven, approaching to the splintery. Lustre 1. Trans 
parency scarce 1. Hardness 9. Colour azure blue, 
and sometimes brown and green. Streak white. Be 
fore the blow-pipe whitens and becomes rifty; but is 
infusible per se. 
GENUS VIII. SNAW. 
Sp. 1. Pimelite. 
The mineral distinguished by this name is an eartby 
substance, of an apple green colour, which accompanies 
the chrysopase of Tkosemütz. Klaproth has analysed 
it, and found it composed of the following ingredients. 
35.00 silica 
15.62 oxide of nickel 
5.00 alumina 
4.58 oxide of iron 
1.25 magnesia 
37.91 water 
99.361 
t Ibid. 326. 
1 Jour. &e. Plyr. li. 39. 
* Kirwan, i. 325.