1833.] Sulphate of Iron from the Hills of Behar. 321 
VII.—Notice of a Native Sulphate of Alumina from the Aluminous Rocks 
of Nipdl. By J. Stevenson, Esq. Superintendent H. C. Saltpetre Fac- 
tories in Behar. : 
This mineral was purchased by myself from a Nipal merchant. It is 
called by the natives of Tirhat, Sulajét (rock sweat), and is used 
by the native doctors of this country to cure green wounds, or bruises. 
It is sold at the rate of two rupees weight for a rupee. 
Description. 
In small light lumps, colour brownish white—externally anhydrous 
—internally semi-crystalline—fracture slightly fibrous, with a lustre 
resembling asbestus—porous—containing small cavities, lined with 
scarcely perceptible needle-like crystals—adheres a little to the tongue. 
Taste acidulous saline—soluble in twice its weight of distilled water. 
Specific gravity not ascertained, but probably not quite double the 
weight of distilled water. Friable. 
Examination by Tests. 
Mameric PAPer, Sle ce ee wee No change. 
SUITE oles Sid o5, wasmnsyeoin mets. Changed the blue to pink. 
Muriate of Barytes,............. Copious precipitate of Sulphate of Barytes. 
Nitrate of Silver, ...........-.. No change. 
Oxalate of Ammonia, .......... Do. do. 
Prussiate of Potass, .......0.+.2 Precipitate of Prussian-blue, but not copious. 
Solution of Sub-carbonate of Potass, Copious Precipitate of Alumina. 
A careful analysis of this mineral produced the following result : 
Sulphate of Alumina, ..... pile fh Pi bace! he A eho ae 95.0 
Werdsice br rows! Feet. ee Sees 3.0 
Ensoluble matter (silexX) 5)... 0's ee es 1.0 
Loss, Sse se ys aed. PLO SNS. 1.0 
100.0 
ES SS YS eS 
VIII.—Notice of a Native Sulphate of Iron from the Hills of Behar, 
and used by Native Dyers of Patna. By Ditto. 
DEscRIPTION. 
In lumps—colour, externally, light yellow—internally, light grey,— 
with a tinge of blue fracture, earthy and rough granular—porous, 
slightly glistening, anhydrous—easily frangible, soft—not ponderous 
—adheres slightly to the tongue—taste a little acid, leaving a sensa- 
tion of sweetness. Very friable—specific gravity not ascertained, but 
probably about 1,800. 
TT 
