^20 Mr W. H. Keating’s Account q/‘a new Mineral 
The hardness of this mineral is intermediate between that of 
fluor-spar and apatite. It is very readily scratched by pyroxene, 
(Malacolite). 
Its specific gravity varies from 3.51 to 3.55. I have in one 
instance obtained it as high as 3.64, but 1 suspect the mineral 
to have been mixed with Franklinite. 
Its colour is dark olive-green, passing into brown. 
It is slightly translucent upon the edges. 
Its lustre is slight, but semi-metallic upon the faces of cleav- 
age ; in the transverse fracture it is resinous. 
The fracture is lamellar, when in the direction of cleavage, 
otherwise it is uneven. 
When scratched with a knife, the streak is greyish. 
The colour of the powder is a light-green. 
Before the blowpipe it melts readily into a dark-coloured glo- 
bule. 
It displays no electric signs, either naturally or by heat or 
friction. 
It is not magnetic, either in the common way, or by the in- 
genious method of double magnetism, which we owe to Abbd 
Haiiy. 
The acids do not act upon it when cold. When digested a 
long time with boiling nitro-muriatic acid about is dissolved. 
The residue is of a lighter colour. 
Its chemical composition was ascertained by two analyses, the 
results of which were strikingly similar, and were as follows : 
Silex, - - - - 0.560 containing oxygen 29.14700 29 
Lime, - . - 0.151 4.24159 4 
Protoxide of Manganese, 0.135 2.95790 3 
Peroxide of Iron, - 0.100 3.06600 3 
Oxide of Zinc, - - 0.010 
Alumine, - - - 0.020 
Loss by calcination, - 0.010 
0.986 
Loss, - - 0.014 
1.000 
By assuming the mineralogical formula 4CA® -{■ S 7 ng 
