Dr Anderson’s Account of new Mineral Species. 151 
neral from Aker, long taken for amphodelite, which it closely 
resembles in external characters. It is found disseminated in 
cale spar in grains about the size of hemp seed. It is not re- 
gularly crystallized, but has a crystalline fracture, with natu- 
ral cleavage planes. It is softer than cale spar, but harder than 
gypsum. Sp. gr. 2.72. When heated before the blowpipe, 
it gives off water and loses colour. It melts with great diffi- 
culty into a white slag; with borax and microcosmie salt, it 
fuses with great difficulty ; with soda it melts easily, and an ad- 
ditional quantity does not render it less fusible. The distine- 
tions between it and amphodelite are these, that amphodelite 
scratches fluor spar, but Rosite is scratched by it ; amphodelite 
is more difficultly fusible alone, and easily so with a little soda, 
but with a larger quantity is infusible. The composition of 
Rosite is— 
Silicic acid, 2 ; : 44,901 
Alumina, 4 z - 04.506 
Perox. of iron, : 3 0.688 
Ox. manganese, . : - 0.191 
Potassa, 3 7 : 6.628 
Soda—trace. 
Lime, . F A - 3.592 
Magnesia, - : : 2.498 
Water, ; é A 5 6.333 
99.337 
Saponite.—Under this name, Swanberg has described a mi- 
neral found in the Braskvedst Svartvik mines in Dalecarlia ; 
it is met with filling up a cleft in the rock about an inch wide. 
When first obtained it is soft and of the consistence of soap or 
butter, but by exposure to the air, becomes hard, forming in 
part lumps, and in part falling into powder. It is easily 
scratched by the nail. Colour white, yellowish, or red; has an 
unctuous feel; adheres to the tongue. Before the blowpipe, it 
gives much water, and becomes black, like most magnesian 
minerals ; fuses with borax and microcosmic salt, and, with 
soda, gives an opaque glass. Its analysis gives the following 
composition :— 
