3. Orpiment is found in imbedded nodules, and rarely in imbedded 

 crystals, in blue clay, accompanied by sulpbur. 



4. It occurs atTajowa near Neusohl in Lower Hungary, in the neigh- 

 borhood of Vienna, and in Wallachia and Servia. At Kapnik in Transyl- 

 vania, and Felsobanya in Upper Hungary, it occurs in metalliferous 

 veins, with Galena, Blende, Native Arsenic an(f Realgar. It is found 

 likewise in Natolia, China and Mexico. 



5. It is used as a pigment. 



ORTHITE. (See Mlanite.} 



OSMELITE. 



Massive : composition columnar, individuals thin and scopi- 

 formly or stellulatly arranged, and these aggregations collected 

 again into coarse granular concretions. 



Cleavage only in one direction. 



Lustre resinous or oily. Color greyish white, but after being 

 exposed to the weather, dark hair-brown. Translucent. 



Hardness intermediate between 4-0 and 5-0. Sp. gr. =2-79. . . 

 2-83. 



1. It emits at common temperatures an argillaceous odor, which is in- 

 creased by breathing upon it. In the mouth it tastes like clay, but un- 

 dergoes no separation of parts. 



2. It occurs in Calcareous Spar mixed wifli Datholite in veins in Tra- 

 chyte, at Niedeikerchen, near Wolfstein on the Rhine. 



OSTRANITE. 



Primary form. Right rhombic prism. M on M = 96. 



Secondary forms. The primary form, having the acute lateral 

 edges slightly modified, and the angles of the base deeply trun- 

 cated. 



Cleavage, parallel to the smaller diagonal of the base, scarcely 

 perceptible. 



Lustre Titreous. Color clove-brown. 



Hardness = 7-0 ... 8-0. Sp. gr. = 4-3 . . . 4-4. 



