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—— 
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1883.] Mineralogy. 315 
mixture of garnet-colored eudialite. The lepidolite was shown 
to have a composition differing from that usually ascribed to that 
species in having a larger percentage of silica, less than half the 
quantity of alumina, and unusually large quantities of alkalies 
and of water, while no fluorine was present. It is fusible in a 
candle-flame. This may be a new species of the mica group. 
Another mineral of interest occurs in curved, irregular crystals 
inthe same rock. It has a hardness of 4, specific gravity 3.38, 
and has a brown color and white streak. It fuses readily before 
the blowpipe to a gray, dull bead. 
The following composition was obtained : 
SiO, TaOQ, FeO, Al,O, ThO MnO CeO LaO . DIO 
ee ere | 
` o. 9 . < j . 
‘an Naw Ho 2.41 7.09 4.20 10.66 17.04 
309 7.98 7.28 = 98.38 
The substance appearing to be a new species, the author has 
sit it Steenstrupine, after Mr. Steenstrup, the discoverer of the 
mineral. 
Tin iy ALaBaMA.—It is reported that valuable loads of tin- 
bearing rocks have been discovered at the Broad Arrow mines, 
near Ashland, Clay county, Alabama. The tin occurs as cassi- 
terite finely disseminated in gneiss. The ore is being crushed 
and reduced to the metallic state on the spot, works having been 
erected for the purpose. A bar of tin thus made has already 
been received in New York. 
TELLURIFEROUS CoppEer.—Professor T. Egleston, of N. Y., has 
reported to the American Institute of Mining Engineers an in- 
teresting case of the presence of tellurium in copper and of its 
effect upon the latter metal. 
me copper ore from Colorado had been sent to him to exam- 
ine for arsenic and antimony. Finding neither metal present, a 
large quantity of the ore was purchased by a metallurgical firm, 
wao, however, reported that they were unable to refine it, the 
urnaces having been “ poisoned” by arsenic or antimony. n 
a re-examination of a larger quantity of material a trace of tellu- 
Henia discovered, the quantity being less than one-tenth of a 
aigh present in such minute quantity, the tellurium ren- 
thro the copper “ red-shot.” When the refined copper was passed 
x nee the rollers cracks showed themselves, which became 
Ser the more the copper was rolled, until finally the cake of 
pe, 3 fell to pieces. When heated repeatedly the „copper be- 
pee e quality of the copper. The influence of such a minute 
ty of tellurium upon the copper is surprising. 
You, XVIL—Nọ. i, ae 
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