318 Ff, A. Genth—Contributions to Mineralogy. 
certainly should not be placed under native bismuth and con- 
sidered as varieties of this mineral. It is far more rational to 
The bornite from San José, Brazil, requires reéxamination, 
before its true nature can be established. 
g. Montanite, a new mineral, BiO,TeO,HO (or 2HO).— 
Results from the oxydation of tetradymite. I first distin- 
guished it as a new mineral in the examination of the Montana 
Deeming a fuller investigation of much interest 
t 
It is very probable that the “ yellow owyd of bismuth” from 
the Whiteha!l mine, Va., observed by Dr. Jackson (this Journ., 
[II], x, 78), is the same mineral. 
ot crystallized, but some portions still retaining the scaly 
structure of the origial tetradymite, and being in reality pseu- 
domorphous after it (N. C.). Earthy incrustations, Color yel- 
towish, greenish and reddish white ; luster waxy to dull. - H. 
Brittle. 
B.B. reactions of bismuth and tellurium. Yields water, 
when heated ina tube. Gives off chlorine, when heated with 
morn d chlorhydric acid, dissolves easily in dilute chlorhydric 
oe 
