Mineralogy and Geology, 133 
owey Hie recentl rl published a still more incomplete 
xlvi, enact 1868) of the same 
mineral, which fe hae Re ivigtite, and I think it therefore 
proper also to make my examinations known, as they may throw 
pears then as an olive-green solid mass, often quite transparent. 
not fuse before the blowpipe (Mr. Kiana oe i probably 
got his sample mixed with cryolite, as he has it to melt 
tion. Analyses I. and III. were made by fusion with carbonate of 
soda; IL was Sebanpoted vith fluohydric acid. 
I (yellow sents II. 11 (green mass). Mean. 
so SURO sees 41°41 
Aiea’ ahh Lares 3902 pgp ~=—Ss«SH°01 
Sod ae 10°27 aia. 10°27 
Pak ee 1°05 eee 1 
Water, 3°06 ae 3°93 3°49 
Fluorine, trace tse trace trace 
Oss, fae et ao 4°77 
100°00 
Adding the alkalies to analysis III, we have 
Si 42-82, Fe 13-06, 41 27-08, Na 10-27, K 1-05, H 3-93, Fir. = 98°16. 
Rl pould give nearly the ratio of a unisilicate, 1:6: 8: ae 
orm : 
3(Hla, Fe.)Sia + (Na, K)Si + HO. : 
The great Sifforesise between Mr. Rand’s and my auslyseqoun 
Pretaps be accounted for by Mr. Rand’s had a icoxeneotal 
ae of ce yore’ in hissample. The eryo. ‘would increase 
