Sixth Supplement to Dana’s Mineralogy. 359 
on the acid requiring a larger supply of base; 1+8:12, (=4:12,) becomes by the 
addition of the water eo hes or if two parts only of the water be basic, 6: 12=1:2 
With 4H in excess.— 
TANTALITE [p. .s nd TIL IV, V].—Analyses of the Kimito and Tamela tanta- 
lite by Weber se’ s laboratory (Pogg. civ, 85): 
Sn i 
<— Cu Oa 
: Kimito, 45-71 9°67 980 4:32 trace ——== 99°50 
‘Sl 9: . * * 
3 Tame, 8390 0°86 Bike bi eee —_— = 99'22 
tetetacio . Tn tl m 
lite analyzed by Wornum [Min. Anal., 6], was ——. ly from Kimito, where alone 
the variety containing much tin occurs The we anf a von tin has G.=7:311— 
reg the other, the tin and manganese kind, his Ieiolite fess Suppl 5 ch og ratio 
or R, Sn, Ta, in 1, 3:14: 2°07 : 14.29; in 2, 3°20: 1-95 : 14-49; in 3, 824: 0 : 15°82, 
- The ratio of avers of bases and acids is nearly 
But Rose observes that o nentral artificial ‘compounds of tantalic acid which he 
has formed have so ratio 1:4. He says further, that he has obtained compounds 
with potash and soda oh his researches, having the same ratio as above, but the com- 
bination was not defini ; and also that in the case ‘ae the tonsa ‘tanta lite, the 
psp of iron ma extracted by aerate He hence suggests, that 
true ratio for = native tantalite sis 1:4; and oan ‘other ratios are results of 
alteration leading to an ss of 
Mcumeopey ite ITE, Nordenskisld—A mineral from Hopansuo near Pitka- 
randa in Finland, described by Herliacs (J. f. pr. Chem., Ixxiii, 213), In crystals 
S rphous steatite-like base, which is probably amorphous thermo- 
phy lite. Cleavage perfect; form not distinct; color light-bro silver-white ; 
iy: H.==2'5; G: — . exfoliates like pyrophyllite and vermiculite. 
ss Com 
ne Me Na H 
43°19 4°91 1:99 34:87 133 1314100 
whence the oxygen ratio for Hf, R, #, Si, 11°68: 14-04 : 2°88: 22-40, and the formula 
(R3, 8) Sid+ ont, 
Tsorrre.—The annexed observations on orangite are from a 
to G. fo cog y 
J. Brush. The following are the measurements of two ¢ of orangite 
> The form is a = get A aiegs terminated by a povumid (pluie J and 1). 
esponding angles — 
Zircon. 
T:1=oP: Maton 132° 10’ 
1:1i= P: P=1232° 123° 19° 
844° g4° 20° 
ere made with a common = meter, and for the — until 
te se be considered as und 
xenotime, and orangite are, 
ric. One ; ite” Zreon,senotine, and, orgy ounces, and shows the 
faces ple oe 
at Torbane and other places near Bath- 
TORBANITE —A coal 
gue fa Lange hs, bos py ree acued an 
é extraction of lubricating oils. Greg € Lettsom’s Man. Min., 
