PHYSIOGRAPHY. 281 



lolite Iridosmine Iron Pyrites. 



the variety from the last place has been called Steinheilite. lolite also 

 comes from Siberia and from Lunzenau in the Erzgebirge. 



It is found in the U. S. at Haddam in Connecticut, associated with 

 Garnet and Anthophyllite in gneiss. 



4. The Saphire cFeau of the jewellers is a transparent variety of the 

 present species from Ceylon. 



IRIDOSMINE. Iridosmic Sclerone-Metal. 



Primary form. Regular hexagonal prism. 



Cleavage indistinct, and only in the direction of the bases. 



In grains. 



Lustre metallic. Color between silver-white and lead- 

 grey. 



Malleable with difficulty. Hardness =6-5. Sp. gr. = 

 17-96... 18-57. 



V 



1. It undergoes no perceptible change when heated before the blow- 

 pipe. Heated with nitre, it affords the characteristic odor of osmium and 

 a mass soluble in water, to which, when nitric acid is added, a green pre- 

 cipitate makes its appearance. 



2. Analysis. 

 By THOMSON. 



Osmium 24*5 



Iridium - - - - - 72-9 

 Iron 2-6 



3. It is found with Native Platina, at Nijnotaguilsk, in the Urals, and 

 in South America. 



IRON PYRITES. Hexahedral Iron-Pyrites. 



MOHS. 



Primary form. Cube. 

 Secondary forms. 



1. 2. 



Cube, with angles truncated. Regular octahedron. 



Shoreham, (Vt.) Marietta, (Ohio.) Haddam, (Conn.) Rare. 



24* 



