PHYSIOGRAPHY. 51 



Mispickel Mohsite. 



position are often very small, or even impalpable and strong- 

 ly connected ; the fracture is uneven. 



1. Before the blow- pipe, upon charcoal, it emits copious arsenical 

 fumes, and melts into a globule, which is nearly pure sulphuret of iron. 

 It is soluble in nitric acid, with the exception of a whitish residue. 



2. Analysis. 



By STROMEYER. 



Iron - - - - - - 36-04 



Arsenic 4288 



Sulphur 21-08 



Certain varieties contain a small proportion of silver, and have hence 

 been called Argentiferous Arsenical Iron. 



3. Mispickel is frequently met with in beds and veins. It is accom- 

 panied by ores of silver, lead and tin, and is often attended by Blende. 



4. It is common in the mining districts of Saxony ; in beds atBreiten- 

 brunn and Raschau 5 in veins at Freiberg and Munzig, and in tin veins 

 at Altenberg, Geyer and Ehrenfriedersdorf ; also in Bohemia, Andreas- 

 berg in the Hartz, Tunaberg in Sweden, and Cornwall. 



The most interesting deposit of this ore in the U. States, is at Franco- 

 ma, N.H., where it occurs in gneiss, crystallized in the above forms. It 

 is associated with Yellow Copper Pyrites. A bed of the massive variety 

 exists at Worcester, (Mass.) A simila'r variety is found at Chatham, 

 (Conn.) along with Copper Nickel ; and at Monroe, (Conn.) with 

 Wolfram, Magnetic Iron Pyrites and Native Bismuth. 



MOHSITE. Uncleavable Iron-Ore. 



Primary form. Rhomboid. P on P =73 43'. 



Secondary form. Twin-crystals, flattened in a direction 

 perpendicular to the axis, presenting the aspect of small 

 flat tables, nearly circular, with alternate re-entering and 

 salient angles on their edges. 



Cleavage not observable. 



Lustre metallic. Color iron-black. Opake. 



Brittle. Hardness, scratches glass. 



1. It is believed to have come from Dauphiny. 



