Intelligence and Miscellanies. 387 



with a drusy surface. Massive varieties usually present the 

 aspect of a coarse-grained mica. 



Its locality is Joachimstal in Bohemia, and must have 

 been found at rather a remote period, as the specimens were 

 discovered in old collections. It is chiefly accompanied 

 with ores of silver as the red silver, the brittle silver, &c. — 

 Brewster''s Journal. 



IV. Glaucolite., described by Mr. Sokoloffij the Russian 

 Journal of Mines. It is found massive, presenting traces of 

 cleavage. The fracture is splintery and uneven ; lustre vi- 

 treous ; color lavender blue passing into green. It is trans- 

 lucent on the edges. Hardness =5°0...6-0. Sp. Gr. 

 =2-721 Bergemann ; =2*9 John. According to Dr. Ber- 

 gemann it consists of 



Sihca ..... 54-58 



Alumine 29.77 



Potash - - - - - 4-57 



Lime - - - - - 11-03 



100-00 



Before the blow pipe it melts with difficulty on the Gdge>, 



but is soluble in borax and salt of phosphorus. It loses its color. 



It occurs in compact feldspar and granular limestone, 



with talc, near Lake Baikal, in Siberia. — Philoscphical 



Mag. and Annals of Philosophy., December, 1827. 



V. Oxahevrite, described by Dr. Brewster, as occurring 

 in acute octahedrons with a square base, having the angles 

 at the base truncated by planes parallel to the axis of the 

 octahedron, and equally inclined to the adjacent sides of the 

 base, so as to form, when enlarged, the faces of a square 

 prism. The color of the crystals is light-gray, leek-green, 

 olive-green, and reddish-brown ; they are nearly as hard as 

 apatite, sp. gr. 2-218. Their general size is about one tenth 

 of an inch in length; their surfaces are even but not brilliant. 

 They cleave with some facility perpendicular to the axis, but 

 in no other direction. According to Dr. Turner, it consists of 



Silica 50-76 



Lime 22-39 



Potash 4-18 



Peroxide of Iron - - - 3-39 



Alumine 1-00 



Fluoric Acid - - - - a trace 



Water - - - - - 17-36 



99-08 



