148 Dr Anderson's Account of new Mineral Species. 
low colour, and of a waxy lustre. Sp. gr. 2.52; hard. 5—6. 
It gives signs of a cleavage plane; is brittle and easily pul- 
verised ; before the blowpipe behaves as Pharmacolite. It 
appears to be a mixture of arseniates of lime, magnesia, and 
manganese. The composition is 
Lime, - ; 4 : 20.96 
Magnesia, s : : 15.61 
Protox. manganese, : 5 4.26 
Arsenic acid, . 5 A 56.46 
Tron—a trace, 
Loss, . ; ' . 0.43 
Esmarkite —Under this name Erdmann has described a mi- 
neral found about 100 paces from the locality of the Praseo- 
lithe (to be afterwards noticed) ; it occurs in granite, in the 
form of large irregular crystals, which seem to be prismatic, 
with the edges and angles rounded ; they are for the most 
part covered with a glittering coat. The crystals have an 
evident cleavage at right angles to the principal axis, and this 
cleavage has a feeble pearly lustre. The longitudinal fracture 
has a resinous lustre; hardness between cale spar and fluor 
spar ; sp. gr. 2.709. Before the blowpipe gives water and be- 
comes bluish grey; melts on the thin edges only, to a green 
glass; fuses with borax and microcosmic salt, with the colour 
of iron; gives a yellow slag with soda. Its composition is 
Silicic acid, 4 : ; : 4 i 45.97 
Alumina, . : : 5 - ‘ : 82208 
Magnesia, : . : : é - 10.82 
Ox. of iron, . 3 . ‘ F - ° 3.83 
— — manganese, . : . . ° 0.41 
Water, ‘. é : : 5 5.49 
Lime, oxides of copper, lead, cobalt, and titanium, 0.45 
98.55 
Euxenite.—Under this name Scheerer has described a mine- 
ral from Jélster in Norway. It is amorphous, dark brown, of 
a metallic resinous lustre, and has an imperfect conchoidal frac- 
ture. In thin plates it is transparent, with a red colour ; gives 
a pale red powder ; sp. gr. 4.60 ; hardness near that of Thorite, 
which, however, it scratches; does not melt alone before the 
blowpipe ; fuses in borax and gives a yellow colour; with 
