/ 
430 C. A Schaeffer—New Tantalite Locality. 
Art. L.—A New Tanitalite Locality ; by eee Y. § 
SCHAEFFER, Cornell Universit 
AMONG some specimens of the minerals found at the Etta tin 
mine, Dakotah, and recently come into my possession, a number 
of pieces, which on first glance were supposed to be cassiterite, 
proved to be tantalite. Professor Blake in speaking of the ore 
from the same locality (this Journal, ITI, xxvi, 235) says, ‘‘a 
few thir ofa black: mineral believed to be wolframite have f 
been seen in the mixtures of spodumene and feldspar.” A 
careful sadvoh of all the specimens received has resulted in 
MUAENG: OFI0E 456. toc eis 79°01 
psi es Iheth smeoiuealnc 0°39 
TE SEITE EY Bay Re POOLE eS 8°33 
Mince aids gis SiGe 12°13 
99°86 
. Lawrence Smith, which actitaivied tungstic acid 
and oxides of zinc and copper, or the mineral from North 
Carolina, apa by Dr. Koenig, which contained a considera- - 
ble quantity of magnesia. 
e book analyzed consisted of fragments, taken from a 
mass about the size of an egg, and was se seas free from any 
peroxidized iron. Its sp. gr. was 7°72. e determination of 
the sp. gr. of three small specimens, sien ee a sample of 
stream tin, which were water-worn and externally brown, gave 
the following results: 6°12, 6°545 and 6°777. 
Accompanying the ore, in addition to the minerals enumera- 
ted by Professor Blake, were found scorodite, containing 
kernels of leucopyrite, and olivenite. Qualitative examination 
showed the two former to be entirely free from sulphur 
* Watt’s Dict., vol. iii, 3d Supl., Pt. 2, p. 1889. 
