140 



Outlines of tlie Mineralogy and Geology 



CLASS I.—E.mTH¥ FOSSILS. 



ORDER I. 



GENUS I LIME 



V 



SPECIES \.— PHOSPHATE OF LIME 



Subspecies I. — Apatite. 



Apatite, Ckaveland^ p. 131. Idem, JOketiy p. 188. Appatite, Jameson, vol. i. 

 p. 536. Phospholite. Kirwan, vol. i. p. 128. 



h 



External Characters. 

 Its colour is green, of which it occurs celandine and mountain 



green. 



« 



Its lustre is glimmering and vitreous. 

 It is translucent. 



It is crystallized in hexagonal prisms. The crystals are small 

 and short; their surface smooth, transversely rent, sometimes 



w 



slightly, longitudinally striated 5 crystals are single and imbed- 

 ded. 



The streak is whitish. 



It is semihard. 



The cross fracture is fine grained uneven, small splintery and 



^ 



foliated. The cleavage is single, parallel to the bases of the prism^ 

 but it is imperfect and indistinct. 



It is brittle. 



It is easily frangible. 



It phosphoresces when laid on a heated iron. 





r^ 



^V 



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