470 
Class I. 
Order I. 
Composi 
tion. 
SIMPLE STONES. 
fracture o ; of the fracture, in the direction of the la 
minæ, from 3 to 1. Transparency 2 to 1. Colour most 
commonly flesh red; but often bluish grey, yellowish 
white, milk white, brownish yellow; and sometimes 
blue, olive green, and even black. 
Variety 3. Labradore felspar.—This variety was dis 
covered on the coast of Labradore by Mr Wolfe; and 
since that time it has been found in Europe. Lustre 2 
to 3 Transparency from 1 to 3. Specific gravity from 
2.67 to 2.6925. Colour grey. In certain positions, 
spots of it reflect a blue, purple, red, or green colour. 
Variety 4. Continuous felspar.—This variety most 
probably belongs to a different species; but as it has not 
hitherto been analysed, I did not think myself at liberty 
to alter its place. 
It is found in large masses. Texture earthy. Frac 
ture uneven, sometimes splintery. Lustre o. Trans 
parency 1. Hardness 10. 
Specific gravity 2.609. Co 
lour reddish grey, reddish yellow, flesh red. 
A specimen of green felspar from Siberia, analysed 
by Vauquelin, contained 
62.83 silica, 
17.02 alumina, 
16.00 potass, 
3.00 lime, 
1.00 oxide of iron. 
99.85 
Sp. 2. 
Lepidolite f. 
Lilalite. 
This stone appears to have been first observed by the 
* Ann. de Cbim. XXX. 106. 
Kirwan, i. 208.—Karsten, Beob, der Berlin, 5 Band, 71.—Klaproth's 
Beitrage, i. 279. and i. 191.