Mineralogy and Geology. 443 
another. Color light clove-brown or chocolate brown ;_ translucent, 
The following analysis shows it to be identical with common sphene. 
: r 
Ti and trace of iron. Si n 
0:00 3183 28°31 0'40=100°54 
At Montreal, Yamaska, Monnoir and Brome mountains. The crystals 
are imbedded in feldspar, minute, of an amber or honey-yellow color, 
transparent, brilliant, and highly modified. 
Schorlomite.--_Rammetspera has revised his analyses of this mineral 
and states that the formula of J. D. Whitney is the correct one.* Ram- 
melsberg writes it 28? Site Tit. He obtained, (J. f. pr. Ch., Iv, 488,) 
a 
. 2 al 22°34 20°11 157 29°38 136 
Oxygen, 13:11 8:87 603 035 8:36 Ob4 
On Molybdenite from near Reading, Pa.; by C. M. Wernerttt, 
(Trans. Amer. Phil. Soc., x, 345.)--The molybdenite occurs in plates 
and scales in quartz. G.==4°52. BB. on charcoal, white fumes coat- 
ing the coal; alone in a tube, fumes of sulphurous acid. In the pla- 
tinum forceps, colored the outer flame yellowish green. Analysis 
gave Dr. Wetherill :—— 
Mo Fe Si H 
83°198 65°727 3495 2283 0297 
affording, if the impurities are excluded, Sulphur 40-668, molybdenum 
59°332— 100. 
Surface uneven and edges rounded as if ‘subjected to an incipient 
‘usion. G.= 4-595. Composition, Silica 34°07, zirconia 63°50, per- 
oxyd of iron 2-02, water 0-50—= e4 
The proportion of antimony to tron in the ore is about 32 to 
antimony veins of the regions are froma meter to a meter and a half 
In width, but unfortunately they have little horizontal extent, being lost 
0 ramifications, or abruptly disappearing. 
_ Native Metallic Iron.-—-Dr. ANDREWS in an examination into the 
Minute structure of basalt, has found evidence of the existence of iron 
Manative state. After pulverizing the rock and separating with a 
Magnet the grains that were attracted by it, he subjected these grains, 
which were mostly magnetic iron, to the action of an acid solution of 
Sulphate of copper in the field of a microscope. This salt produces 
No change with the oxyd, but if a trace of pure iron be present, 
* The analyses in Dana’s Mineralogy, 3d edit., p. 394, should properly be credited 
to J. D. Whitney.—s. p. p. 
