124 PHYSIOGRAPHY. 



Childrenite Chlorophaeite. 

 CHILDRENITE. 



Primary form. Right rhombic prism. M on M' = 92 48'. 

 Secondary form. 



Fig. 130. 

 P on cor e" - - 114 50' 



P on a 



Pon/ 



e on e' - - 130 20 



Cleavage, imperfect, parallel fo P. Fracture uneven. 

 Lustre vitreous, inclining to resinous. Color yellowish 

 white, wine-yellow, ochre-yellow, and pale yellowish-brown. 

 Streak white. Translucent 

 Hardness = 4-5 . . . 5-0. 



1. Dr. WOLL.ASTON found this mineral to be a compound of phospho- 

 ric acid, alumina, and iron. 



2. It has hitherto been found only in the neighborhood of Tavistock, 

 disposed in rough crystals and crystalline coats on Spathic Iron, Iron Py- 

 rites and Quartz, occasionally accompanied by Fluor. 



3. Childrenite approaches in several of its properties the species La- 

 zulite, the planes a a of whose crystals may be considered as corres- 

 ponding to M M of Childrenite. 



CHLORITE. (See Talc.) 

 CHLOROMELAN. (See Cronstedite.) 

 CHLOROPAL. (See Opal.) 



CHLOROPHJEITE. 



Massive : in small grains, imbedded in basalt or trap, and 

 sometimes hollow. Fracture conchoidal . . . nearly earthy. 



Color pistachio green, and translucent or opake ; but soon 

 turning into brown and black on being exposed to the air, with- 

 out losing its lustre : the same effect takes place in a longer 

 time, to the depth of an inch or two, into the rock. 



Brittle. Hardness, scratched by a quill. Sp. gr. = 2-020. 

 1. Before the blow-pipe, it remains nearly unchanged, altering nei- 

 ther its color nor transparency. Besides silica, it contains iron and a little 

 alumina. It occurs in Scuirmore cliff in the island of Rum, also in Fife- 



