94 C. U. Shepard, Sr.—Mineralogical Contributions. 
charcoal ace a bnted minute traces of tin. The high ada- 
mantine lustre next suggested zircon and tungsten. The color 
was intermediate between that of wohlerite and monazite ; but 
a closer examination showed a wide divergence in other proper- 
ties from either of these spec 
Apparently equilateral banngiiic planes were detected ; and 
finally portions of both pyramids, which leave little doubt that 
the form is that of the regular octahedron, especially as two of 
the solid er clge were each similarly replaced by four planes, 
resting on the octahedral faces. To verify this ie prhiegs of 
a cubic sear. vill require the breaking up of t nt 
ecimens I possess of the crystals, which for the seni I 
efer in the cae of obtaining other Te The hardness 
is 5°to5%5. Brittle, fracture conchoidal, semi-transparent to 
translucent. Luster of fracture, resinous; that of surface of 
crystals, adamantine. Streak ellowish white. 
Before the blow-pipe, infusible. After long heating, it loses 
its brown tint, and while still hot, assumes a feeble citron 
yellow color, which becomes paler on cooling, when it is seen 
to have lost much of its luster, and is also less translucent. 
With microcosmic salt in the outer flame, it slowly dissolves 
into a perfectly colorless, transparent glass ; but in the interior 
flame, it becomes, while warm, slightly milky with a tinge of 
blue. An intermittent flame produced the same transparency 
in the absence of all cleavages as well as in luster and in its 
behavior before the blow-pipe. Its mode of occurrence and 
ioe mineral at Haddam occurs eae ia or upon, the 
columbite. 
_ 8. New locality of Bismuthine and Bismutite in Haddam. 
About thirty years since I pointed out the existence of both 
these species and a third bismuthic mineral, the bismucone, a3 
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