Mineralogy and Geology. 117 
drochlorie acids, and even by aqua-regia. Heated in air it takes fire and 
burns, leaving white ilmenic acid. ‘The specific c gravity of this acid is 
4°10 to 4°20. Its sulphates, chlorid, and several of its salts have been 
dindied and described by M. Hermann 
. Hermann’s researches on columbium, niobium, and the new metal 
imeninm, seem to warrant the conclusion that the formula RQ, is the 
proper expression for the oxyds or acids of a iarge class of metals, which 
are usually placed in distinct groups. .Thus we may put together ura= 
nium, moly cent koneninie titanium, tin, vo fl ) niobi- 
um, pelopium m, and ilmenium. Farther study i is required before we can 
determine the order in bic these should be grouped among themselves, 
But titanium, tungsten, molybdenum, niobium and ilmenium are assim- 
ilated by the fact that their acids all produce a blue color with zinc and 
hydrochloric acid, which Dr. Wollaston described as characteristic of co- 
columbic acid, was from Haddam, the rety hid ose has shown to 
be quite rich in niobic acid. Wollaston undoubtedly obtained the niobic 
acid in his trials, since the pure columbic acid has not this reaction. 
Il. MineraLtocy anp GEoLoGy. 
1. Crystallized. Carbonate of Lead, at Rossie, New York; by G. 
Hapie EY, (communicated for this Toukaal )—Small crystals, an uhh 
of an inch or less in length, are occasionally sneaked thickly over the 
surface of the galena of Rossie, which, when this is the case, is deeply 
roughened or corroded. ‘The crystals are aaa prenin terminating 
in four brilliant planes, two of which meet on an angle of 117° nearly, 
and the other two at an angle of 88°. The Satine. as we 
the blowpipe characters afierwards obtained, evince that the mineral j is 
car ponte of lead. Mus attention was ‘drawn to these crystals by Mr. 
2. On Coracite, a new ore Uranium; by Joun L. LeConre, 
M. D., (from an article apa snwed for this erat ‘heh will appear 
in our next number, nest ef ineral is from the north shore of Lake 
Superior, where it occurs in a vein two inches wide, near the junction of _ 
trap and syenite. It is allied to Pitehblend, from which it appear. (from 
@ quantitative analysis) to differ in the substitution of alumina for the 
Sesquioxyd of uranium. It occurs massive without cleavage, and has a 
cats peer: an uneven sencbatel fracture, and a gray streak. H=45, 
=43 
3. Plumbo-resinite and Ct Sulphato-carbonate of. Soar in 
Missouri; by Me LeConte oD a (communicated for this nal. ) 
of the Missouri black cobalt. It has a ies lustre, and sometimes ap- 
pears pire over the botryoidal cobalt ore but is almost transparent 
off. 
when sc sc 
A cimens from the Mine’ La Motte, fnave detected a green 
‘mineral, abe ing in color from pale apple green to dark verdigris green, 
and having a radiated structure consisting of acicular crystals loosely ag- 
gregated. I have not yet seen perfect crystals, but from some trials have 
determined it to be the rare ne et sulphato-carbonate of lead. It oc- 
curs with the bisa of cobalt. 
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