136 Seventh Supplement to Dana’s Mineralogy. 
Hratoruane [I, III, 4S Ms —Stockar-Escher has analyzed hyalophane and found it 
to contain (Kenngott’s Min. Forsch., 1856, 7, p. 107): 
Si Al Ba Ca Mg K Na ign. 
52°67 21-07 15 05 0-46 0°04 782 214 0'°58=99°83 
This makes it an oligoclase_with part of the at replaced by baryta, giving 
the formula cK, rons if RISi2, Specific gravity =2°801.—Kenngott’s Min. Forsch. 
for 1856, ’57, p 
Ituentre [p. 1 V].—The varieties of titanic iron have been investigated 
recently . Mimmesberg (Fogg, civ, 497). The following are the mean results of 
his analyses, The last contains the ratio of FeTi to ¥e which he has de- 
duced from the compte. , from ngelsberg beg Hof-Gastein, [same analyze 
tng Kobell, Min. No.1]; 2, Layton’s Farm, near Warwick, Orange Co., New 
ork; 3, [Imen Mts., Ural [Min, Nos, 8, 4, 5, id Schmidt below]; 4, Egersund, 
Norway [Min., Nos. 7, 8,9, 10]; 6, rée, Norway; sh ne, from Iserwiese; 
¥e Fe Mn Mg fet ES 
L. 689 30 =1°65= 99°94 
2. 431344293 5771 —— 2682 0:90 13-71= 99:14 
81—4873 4593 1430 -3652 272 059=100-06 
4, 4744&4791 5130 8874 39°83 trace 0°40=100°40 
5. 4701 4 2 
: 29° 3 : 
wg 4676 42:20 2336 30°57 1°74 157= 99-44 
. . 9 
8, 5-060 1620 69°91 1260 0-77 ete 
9. 4943 1008. TTT BER: Se ee AN 4o=o8s0 
10.6 6127465150 918 8192 860 ——~— ——=— 
11. 5187 & 5°209 910 8341 763 044 fr, =100388 
te et et et et 0 9 0 OD St 
ie is is Ch oe ee ee wot 
we 
2°26 0-44 
A. 4-400 5719. 1567 26-00 —— Teor ee 
B. 4905 827 5181 37:22 203 078=100-11 
C. 5-075 520 61:36 38025 123 048= 98-52 
@ Trace of Mn, 5 Mean of two cme 
ore “pega t conclusions of Rammelsberg from his researches are as fol- 
FR th ) The common es Ber 2 is FeTi. (2.) Magnesia in the nai "of “ther 
laces part of the Bier ; ear 
wick, it amounts to 14 per cent, the composition corresponding to the formula FeTi 
magnesium elsberg also concludes that there i tahedral a 
on and that Tere dumiye: is A) is a combination of Pel a and pete | in the ratio 
(The ratios between the FeTi and Fe deduced  preee elsberg are not in most 
cases the precise results of the analyses. Thus in No, 4, the ratio obtained for the 
Sie dhe fem of {emai MOE (be seco with which titanic iron 
titanium, manganese and 
