rf sight 
ae 
IIL. Mineranocy anp Gronoey. 
1. Oriental Jade and Tremolite, by M. Damour, (Ann. de Ch. et de 
Phys. April, 1846 ; Phil. Mag. xxiii, 568.)—The jade selected for anal- 
eS ysis had been worked in India; it was of a milk-white color and semi- 
transparent, and had the appearance of white wax, or perhaps rather 
Spermaceti.. Its fracture was splintery ; it scratched glass, but feebly. 
Its specific gravity was found to be 2:970. Its tenacity was very great ; 
when reduced to powder and heated in a glass tube, its appearance was 
‘Not altered, and it yielded no water. In the flame of the blowpipe it 
swells up, and fuses slowly into a milk-white enamel. Borax dissolves 
, it without color ; the salt of phosphorus dissolves it, leaving a skeleton 
hd silica, It is not sensibly acted upon by hydrochloric acid. | 
~ Two analyses gave the following results :— : 
a. ilies, : oF pegs ; 58°46 5802 |. 
“Lime, ¢ , ‘ ; AE A 11-82 
Ber eNO MA, Re ge: OE Se BR er ha ED 
_ Protoxide of iron, . a ee ‘T12- 
. a 98-76 98°15 
__M. Damour having observed that this is precisely the composition of 
_ Temolite (white hornblende), submitted this substance to the same pro- 
Ces of analysis as that adopted with the jade. The specimen which 
he selected was from St. Gothard, and in colorless crystals, very per- 
__‘Heetand associated with granular dolomite, which was separated by hy- 
_____-‘“techloric acid previously to analysis. = pe ee 
|, Wyielded—sitica 58-07, lime 12-99, magnesia 24°46, protoxide of 
oe rn | in 
From Ee similarity of these results, M. Damour is of opinion that 
this jade may be ranked with tremolite ; and if this opinion should be 
% opted, he observes, that in collections oriental jade will hereafter be 
: assed as compact tremolite. : 
— & Substances in Guano; by E. F. Tescuemacuer, (Phil. Mag. 
— 546, June, 1846.)—Mr. Teschemacher has detected the following 
_ *Ubstances in guano :— be ied 
te Phosphate of Ammonia, occurring as a crystalline salt, perfectly 
in Tent, with a brilliant cleavage in one direction. The quantity 
| _ Was too small for an analysis. eae 8 
i Bicarbonate of Ammonia, mixed with guano in its cavities as a crys- 
talline salt, having brilliant cleavage in two directions. Measurement 
With t e reflecting goniometer gave the angle of 112° between the ad- 
E sind planes. It proved on analysis to consist of ammonia 21-0, car- 
ue acid 55-50, water 23°50, —100, affording nearly the formula 
Ts+2CO,42H0. 
