OXIDES. 
93 
Genus II. 
A specimen of this variety, analysed by Bergman, 
Species I. 
contained . ... 
52 zinc 
26 sulphur 
4 copper 
8 iron 
6 silica 
4 water 
100* 
GENUS II. OXIDES OF ZINC. 
Sp. 1. White oxide of zinct. 
Calamine. 
This ore is either found loose, or in masses, or cry 
stallized. The primitive form of its crystals appears, 
Dryedk 
from the mechanical division of one of them by Mr 
Hauy, to be an octahedron composed of two four 
sided pyramids, whose sides are equilateral trianglest. 
But the crystals are minute, and their figure not very 
distinct. They are either four or six sided tables with 
bevelled edges, six-sided prisms, or three-sided pyra 
mids. 
Colour commonly white, grey, or yellow. Lustre Propérties. 
often o, sometimes 2 or 1. Opaque. The crystals 
are somewhat transparent. Hardness from 4 to 9, 
sometimes in powder. Specific gravity from 2.585 to 
3.674§. When heated, becomes electric, without fric 
tion, like the tourmaline . Not blackened by sulphu 
ret of ammonia. Soluble in sulphuric acid. Before 
the blow-pipe decrepitates, and does not melt. 
* Bergman, ui. 335. 
Kirwan,ji. 233—Bergman, i. 321. 
1 Jour. de Min. No. xxxii. 596. 
§ Kirwan. 
Hauy, Jour. de Min. No. xxxii. 596.