oe > ee he a 
4 
Reéxamination of American Minerals. 379 
No. 2 is the analysis already published in the paper before 
mentioned. In both instances, there was an excess, owing to the 
peroxydation of a portion of the lanthanum,—a circumstance 
that cannot be avoided, nor do we know how to allow for it in 
our calculation. © This mineral has the same formula as the arti- 
ficial carbonate, namely, La G+sff = Carbonic acid 21°11, oxyd 
of lanthanum 52:94, water 25:95. 
The ing other known locality of this mineral is Bastnias in 
Sweden ; it is there found only as a coating to Cerite, and doubt- 
less was not obtained in a perfectly pe state oy Hisinger, who 
gave as its formula, La? 6431. .-I have no dou o the miner- 
als being identical, ‘and that whaleree ihe Baas ened is ob- 
- crystallized, it will prove to have the same composition as 
Bethlehem variety. 
43. Mangano-magnesian Alum from Utah. 
This alum was observed a few years ago by Dr. Gale, among 
specimens brought from the Salt Lake, in Utah, by Mr. Stans- 
bury. It occurs at a place called Alum’ Point, and was consid- 
ered altogethe er a manganese alum, of which Dr. Gale gave what 
he then stated he considered an imperfect es (Am. Journal 
Science, vol. xv, 2nd ser., 434): 
8 18:0 Mn 89 Hao °° | 130 
Being desirous of having it more Darel analyzed, Dr. Gale 
placed in my hands the specimen which is the subject of the 
present investigation. It was not eatad as it occurs at the lo- 
cality, but had been recrystallized and consisted of delicate needle- 
shaped crystals, seahaia in small masses. It dissolves very read- 
ily in water ; in fact so soluble is it that it is difficult to decide the 
amount of water races for its complete solution. It oe 
zes from solution in the form of delicate paren with a p umose 
on On analysis it furnishe 

10-40 10°65 
Magnesia, 3 504 5'65 
Manganese, . : ; me 21 2°41 
Sulphuric acid, ; ? ;. SB 8D 85°92 
Oxyd of iron, " : ; O15 0:09 
Potash, . ‘ 3 ; co ORO 0-20 
wane : : ae a , 46°00 > 46°75 
100° GG: 3 101:67 
This sis ron s an of protoxyds.a. little. too high 
for the analysis how wt the fo Ria of alum, but this however, is 
frequent occurrence in the natural alums, owing to admixture of 
impurities. This variety of alam has been before observed by 
Stromeyer, and was y brought from’ a cave in ceo Africa. Its 
fornaelais,'° me 

© (Stig; Ma) 8 + FaSe+ 2484. 
