128 O. D. Allen—Hatchettolite and Samarskite. 
Art. X VIII.— Chemical constitution of Hatchettolite and Samarskite 
from Mitchell County, North Carolina; by Oscar D. ALLEN, 
Professor of Analytical Chemistry, Sheffield Scientific School. 
Contributions from the Sheffield Laboratory. No. XLVI. 
I. Hatchettolite. 
with pyrochlore. t time I was to make only a 
partial qualitative analysis of this mineral with -25 gram placed 
at my disposal by E.S. Dana. The result showed the presence 
n an elaborate paper on American columbic acid minerals, 
published in this ptt (May, 1877), Professor J. Lawrence 
Smith has also given a description, accompanied by analyses, of 
this mineral, for which he has proposed the name Hatchettolite. 
Having recently obtained from Mr. L. Stadtmiiller a specimen 
of this new mineral, which he received in a lot of Samarskite 
sent to him from the locality above mentioned, 1 have analyzed 
it, hoping to gain some additional facts bearing on its chemi 
constitution. The specimen was a large, but imperfect crystal. 
t was broken into small pieces, and afforded twelve grams 0 
material judged sufficiently pure for analysis. Pieces from dif- 
ferent parts of the mass gave the specific gravities, 4°77, 484, 
4°82, 4°90, 476. The results obtained are here presented, Nos. 
tand 1, together with one of the analyses of Dr. Smith, No. 11. 
(1.) (11) (iI1.) 
Tantalic acid ___.. See re 29°83 29°60 
Colambic acid ...-......... 34°24 35°94 67°36 
RAO BOT sn ess 1°61 | 
Tungstic and stannic acids. _ . 30 60 
UTaguim Oc100,... .-.-.... 15°50 15°63 
Bate an oo ee 8°87 8°89 7°09 
Yttria and cerium oxides ____ "86 
cron Prowride 2 2°19 2°33 2°51 
Magnesia’ soo ee: 15 
Potato trace* 1°21 
Soda -20So ee sick ee 
Water lost by heat --...... 4°49 4:42 
MU SS his trace trace 
98°55 100°18 
