Highth Supplement to Dana’s Mineralogy. 381 
from each other. €u and Ag appear to replace each other in this mineral in all 
oa The formula is (€u, Ag, Fe)S. 
TALKOID, Naumann (Mineralogie, ~ ve 255).—The s oh crystalline tale 
fon Prete ete d by Scheerer (Pogg. Ann., Ixxiv, 321, thi ver ah xiv, 39) 
has amed talkoid by Naumann. iti Gs snow white and broly ager 961 
chang megueti ite at Presnitz. Sp. gr. 2°48. Composition, according 
: Si : Fe Mn €a H 
1. 58:46 0-09 1:09 061 3283 656 = 99°64 
2 58-40 0:06 101 03 39 0°s1 82:07 6:56 = 99°50 
for which Naumann ey the formula Mg*Si°+-H. 
Tanratrre [p. 351, ITI—VI].—A. E. Nordenskiéld has analyzed tantalite from s 
new locality at Bp in Finland ae Ann., evii, Prod 
Sn 
83° 79 1°78 13: 42 1 €3 100°62 
the Paubling ratio between the bases and the vets aid is 1:4°83, most fikidty 
the oo of the Tammela tan 
Texxantrre [p. et hese Rath has asia the following analyses of ten- 
hantite tes Cara ee a a a Ver. d. Rheinlande u. Westphalens, 
xv, 8. Ixxii, in Kopp’ 5 Tshresbericht 1858, 
5 Ss C ee : 
la. » 4659, 95:92 4688 640 133 1872 = 9855 
as OTS AAS ORS 18 COT 
8 18 0¢ 
No. la is the direct result of the pode 
copper, and assuming nt : 
and averaging the analysis to one tet gives the result as in 
No. 2 was by Baumert. According to v. Rat th, the ratio between the metallic sul- 
and eg oe ae of arsenic in te nnantite is 5:4, while the analogous ratio 
a [ Pogg. Ann., cviii, 648) has e: wamciaed 
p. 270, II, IV, VI1]—Jenzsch (Pogg. 4 
4 crystal e tourmaline from Elba which he hag fo oe op poner farce y bi-axial. He 
i ht rmaline erys m Etba and 
rom his sreoieh vay eke that although the a Ftd ne th bel eith 
noclini 
ious] 
Measurements, Breithaupt publishes a preliminary notice in the Berg und Hiitten- 
nnische Zeitung, xix, 9g, of a forthcoming monograph on this su 
Tatrarines [p. 406, 513] —F. Oesten obtained from the analysis of a very pure 
*pecimen of teiphy tins res Bodenmais in Bavaria er Ann., ae 498): 
ite g 
O=s545—9561. 4419 sea1 563 O76 289 709 OOF O74 0-40=10005 
vo gives the oxygen ratio between the bases and ae on 15°34: Thora 
‘5, and the formula, R3, the same as first propo y F 
“recent note ine: Ane: evii, Bil), ¢ ps attention to the fact that not pom 
og he published results giving the above formula, says moreover, viii, 648) 
ate exists as sesquioxyd. Oesten has since (Pogg. Ann., aa 
, pee examined was entirely unaltered, 
pall fh TI, pa gate (Pogg. Ann., evii, 590) has sae seca 
te from Norway which prove to be a new co Whe chou 
per we of potash, and distinct from the tyrite of Forbes. 
found to be: 
tree te we 0 ta Me KH 
4849 080 135 009 oa Ra? oa 368 112 412 195 tr. T23 $71—=10020 
