C. T. Jack 
- composition with the Braiilien bornith 
368 Ninth Supplement to Dana’s Mineralogy. 
Sritpyomenane [p. 287, II, ee —L. ah dogle eraiey, or, prakt. Chem., — 
397), has found stilpnomelane ab Pen ag n the Parish of Nordmark in Sweden 
occurs in veins sometimes four inches Bg ASE atte radiated foliated, sometimes in 
globular masses intermingled with actinolite Composi 
Si #1 Mg 
45°61 Sy 10 5°00 3°00 9:14 ==100°45 
[The author gives no poet that all the iron exists as protoxyd, thus leaving the 
e mineral in doubt; we have ay eviouly« arsioke attention to the 
ance of snetinicing £ e oxydation of the iron in this mineral, gps discussing 
its relations to the American chalcodite (this pag 12], XXV, 198). —<¢ 
eee [p. 426 ee Field has analyzed He re — the “ Mercedes” mine 
ear Coguimbo, Chili. It is a beautiful fibrous and occurs in considerable 
pot uantity associated with limonite. (Chem. Gaadtie, Te ae Tath, 1859.) 
61 70 27°42 10°25 = 99°37 
This gives the formula Ou‘ ® -++ 81, the same as obtained by Hermann for the orig- 
inal ic from Nischne Tagilsk. 
Ac [p. am —A peculiar ogee A pametiaty of this species occurs in v 
gneiss at riate, onnecticu t. It has a dark leek green color, and a wd “iudiee 
and feel. H.= =2'82. Reateeree Dr. H. H. Lummis in the Laboratory of 
the Yale Satanti rae aah 
i Fe Mg H 
6400 4°75 : 2747 4°30 
yaire [p. 21, 512, I, ye Ger. analyse of tetradymite from Cumberland 
Englanl. by Rammelsberg (Min. e, p. 4): 
Bi Te 
s 
na 6°73 6°43==97°49 
equal to Bi*+Te 
The telluret of os el ae Gold Mine near Dahlonega analyzed by Dr. 
, 39), = promagpe ced by him to be identical in 
ean 
reéxamined by Dr. F. A. Genth 
with the following result : (Min ot ins, (2), i, 358.) 
C 
Bi 0 Fe Au. Tere &e, Se 
Gr941 Ll 50°83@ 48-29 0-06 = tr.=100°00 
: 5097 47°25 0°06 0-2 ose tr== 99° $3 
' fa) by the difference. 
This agrees with the composition obtained by Ei — for the seg a from 
ee Oo. Pleo nia, and differs entirely from and the results of Dr, Jack- 
on. This difference is SF tore by the fact that th the ‘oth ds of ism vie employed 
b Dr. Jack unreliable, and consequently gave erroneous results; attentio 
has been called to this point i in an editorial notice in ‘Erdmann ns af ae praktische 
Coen, ae 507, also in a similar catigh in ue Réperet oire de Chemie gee “g 288, 
as W ent r. Genth (loc. cit.). 
_—G, J. B. 
IK enth has seated sl to Dr. Jackson, (Mining Mag., 
(2), li, 64, January,) ee the i inaccuracies of the methods used . the latter. i. 
Tere u, Vi ne has described a new om of tetra 
hedrite etic Ardihate | ak de Kine) F inci which he calls fourn It ge 
with galena in a quartzose porphy o physica ical characters, pte ciety, 
given. its composition in thr eo 
Pb Fe As Sb Quartz. 
1. G=4319 26:50 - oe Fivoo ©} 6 S50. . O60. 188). Ie: 
$ G.= 4305: 230° 870 1670 “210 580 1600 2740 — 
ag oust fy ds Bike: 1050: 19°20 4250 670 ie: 15°20 
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