238 Intelligence and Miscellaneous Articles, 



Augite from Vesuvius. 



Oxygen. 



Silica 50-90 26-44< 



Alumina 5 37 250 



Lime 22-96 6-4.4. 



Magnesia 14 43 5-58 



Oxide of iron .. 62b 1-42 



9-99 



Uralite from the neighbourhood of Lake Baltym, in the Ural. 

 The Uralite is a kind of hornblend, but possessing the crystalline 

 form of augite*. It forms crystals from 1 to 2 lines in length, which 

 lie scattered in a grayish green matrix. They are of a blackish green 

 colour delicately striped on the surfaces of cleavage, of a pearly 

 lustre, faintly transparent at the edges, and possessing the hardness 

 of apatite. A small quantity of the crystalline matter having been 

 carefully separated from the matrix, had, according to G. Rose, the 

 specific gravity of = S-150. This same quantity submitted to 

 analysis gave 



Oxygen. 



Silica 33 05 27-55 



Alumina 4-56 2-12 



Lime 12-47 3 50 



Magnesia, with a trace ) j^-qq 4-99 



of manganese ..../' 



Oxide of iron 16-37 372 



99-35 



Amphibole from Kienrudgrube, near Konigsberg in Norway. 



Oxygen. 



Silica 4907 25*49 



Alumina 924 4-31 



Lime 10-33 2-90 



Magnesia, contain- 1 ^q-oq 7-85 



ing manganese j 



Oxide of iron 9*77 222 



98-70 



Amphibole from the village of La Prese between Bormio and 

 Tirano. 



Silica 45-31 23-53 



Alumina 11-88 5-54 



Lime 10-49 2-94 



Magnesia,contain. 1 28 5-52 



ing manganese j 



Oxide of iron .. 15*93 3*26 



Titanic, acid with 1 ^ ,.^ 



some silica . . J 



98-55 



♦ G. Rose has given a description of this mineral in Poggendoi-ff 's 

 Amialen der Pht/sik und Chcmic, Band, xxxiii. p. 21. 



