PHYSIOGRAPHY. 291 



Kerasite Kerolite. 



Lustre adamantine, particularly upon the cross-fracture, 

 inclining to pearly upon faces of cleavage. Color yellow- 

 ish white, straw yellow, rose red, pale. Translucent. 



Brittle. Hardness =2-5 . . . 3-0. Sp. gr. =7-077. 



1. It decrepitates slightly before the blow-pipe, and is easily melted ; 

 the globule is of a deeper color than the mineral. On charcoal, it is re- 

 duced, and emits fumes of muriatic acid. Treated with peroxide of cop- 

 per and salt of phosphorus, the flame assumes an intensely blue color. 



2. Analysis. 



By BERZELIUS. 



Oxide of lead .--.-. 90-13 



Muriatic acid 6-84 



Carbonic acid 1-03 



Water 0-54 



3. It is found near Church-hill, in the Mendip Hills in Somersetshire, 



engaged in manganese-ores, and accompanied by several other salts of 



lead, and by Calcareous Spar. 



KERATITE. (See Quartz.) 



KERATOPHYLLITE. (See Hornblende.) 

 KEROLITE. Brittle Atelene-Picrosraine. 



Primary form. Doubly oblique prism. Dimensions 

 unknown. 



Cleavage, parallel with M highly perfect, and easily ob- 

 tained ; less distinct parallel with T, least of all parallel 

 with P. Fracture uneven. Surface of M streaked paral- 

 lel with its combinations with P. 



Lustre pearly upon M, inclining to vitreous ; upon the 

 rest, glimmering or dull. Color oil-green, siskin-green, 

 leek-green, to blackish green, rarely presenting patches of 

 duck-blue. Streak white. Translucent, in thin laminae. 



Sectile. Laminae brittle. Hardness=2*5 . . . 3*0. The 

 lowest degrees upon M : the highest upon the solid angles 

 and edges. Sp. gr. =2-4 . . . 2-6. 



