48 



or crusts, which separate readily on breaking the mineral. 

 This structure seems to lead to the belief that the mineral was 

 deposited from a liquid state gradually, and it may have been 

 formed from a solution. We are not acquainted with any recent 

 examples of the formation of this mineral, either by mineral 

 springs or by volcanic action, and the subject is one of much 

 geological interest. From the circumstance of the association 

 of Specular Iron ore with the Eupychroite and its occurrence 

 in Metamorphic rocks, it would appear that igneous action took 

 place at the epoch of its formation. 



It was formerly supposed that Phosphate of Lime was of or- 

 ganic origin, but the discovery of it in rocks more ancient than 

 organized beings proves that it is one of the primeval substances 

 of our globe, and its occurrence in volcanic rocks has also been 

 recently demonstrated. 



The specific gravity of this mineral is 3.053, Hardness, 4.5. 

 It phosphoresces by heat with a beautiful emerald green light, 

 like that of Chlorophane fluor spar ; hence the name given to it 

 by Emmons. 



When suddenly heated it decrepitates strongly. Before the 

 blowpipe it phosphoresces brilliantly, and at a high temperature 

 glazes on the surface, but does not melt into a globule. 



This mineral was found to consist in 100 parts, of 



Lime, 



Phosphoric Acid, . 

 Carbonic Acid, . 

 Lime, . 

 Chlorine, . 

 Calcium, 



Fluorine — by diff. 

 Calcium, 

 Protoxide of Iron, 

 Water, 



100.000 



The pure Phosphate of Lime in the mineral amounts to 92.94 

 per cent. 



One hundred tons of this mineral have been extracted from 

 the mine, as I am informed by Mr. Flammond, and I learn that 



