Geology and Mineralogy. 399 
ness=4'5-5,. Specific gravity=3°697. Luster vitreous to greasy- 
adamantine. Color yellowish to reddish brown, the crystals - 
occasionally topaz- to wine-yellow. Transparent to translucent. 
Fuses in the naked lamp-fiame, and B. B. in the forceps colors the 
flame pale green. Completely soluble in the fluxes, giving reac- 
tions for iron and manganese. uble in nitric and hydrochloric 
acid. Analyses by 8. L. Penfield have proved it to be a hydrous 
eee of manganese and iron, giving the atomic ratio of 
?,0,: RO: H,O of 1: 4:1. This corresponds to the formula 
R,P,0,, H,O=R,P,0,+H,RO,. The mineral in external charac- 
ter has a marked resemblance to triplite, and this fact is expressed 
in the name which has been given it 
NSONITE curs foliated massive; often lamellar 
radiate, the laminw being sometimes straigh t more often 
rv ne instance observed in tabular crystals with stri- 
Before the blowpipe in the forceps fuses at 1 to a black magnetic 
globule, and colors the flame pale-green with an occasional faint 
tinge of red ith the fluxes gives reactions for iro an- 
¥ the 
nese, Soluble in acids. The chemical i now in progress 
y S. L. Penfield indicates it to be a hydrous phosphate of iron and 
manganese with alkalies, the spectroscope showing the presence 
of both soda and lithia. ‘ 5 
The above species are from a deposit of manganese minerals in 
avein of coarse albitic granite which has been quarried for mica. 
Associated with them is a considerable amount of a ferriferous 
ganese; all these apparently are products of the oxidation of the 
her minerals. e have also determined the presence of vivi- 
anite, hebronite, apatite, and some other phosphates whose com- 
position needs further investigation before a final conclusion in 
the ne sles, y 
iade. wi Wi d all the facts in regard to 
made, with sone still in progress, an i a ttake alle 
11. Mineralogy: Vol. 1, The General Principles of Mineralogy : 
by J. H. Gece F.G.S. 206 pp. 8vo. New York, 1878. (G. P. 
