432 Scientific Intelligence. 
eral, but has carefully worked the locality and observed the 
associations in which it is there found. A preliminary notice of 
e mineral under this name was published at the time by Profes- 
sor Leeds, of Hoboken; but the interesting relations which the 
mineral bears to the subject of this paper have made a further 
examination desirable. 
mass must be very small. 
This mineral is not so hygroscopic as Jefferisite, and no difficulty 
was found In drying the material for analysis. W 
exfoliates like other species of vermiculite, but not nearly to 8° 
great an extent as Jefferisite. After ignition it is decomposed by 
ydrochloric acid, The specific gravity of the green variety, mea” 
