36 PHYSIOGRAPHY. 



Aphthitalite. Apophyllite. 



3. It has hitherto been found only in Cornwall, with several other 

 species of the salts of copper, and with Copper Pyrites and Quartz. 



APHRITE. (See Calcareous- Spar.) 



APLOME. (See Garnet.) 



APHTHITALITE. Prismatoidal Glauber- 

 Salt. 



Massive $* rnammillary, apparently formed in successive 

 layers. 



Lustre vitreous. Color white, with certain bluish or 

 greenish stains. Translucent. 



Rather brittle. Hardness = 2-5... 3-0. Sp. gr. = 

 1-731. 



Taste saline and bitter, disagreeable. 



1. It has not been analyzed, but probably will be found to be a sulphate 

 of potash, with a trace of sulphate and muriate of copper. 

 2. It occurs at Mount Vesuvius. 



APOPHYLLITE. Pyramidal Kouphone- 

 Spar. MOHS. 



Primary form. Right square prism. 



* The artificial crystals are right rhombic prisms of 112 &, having 

 their acute angles replaced so as to form dihedral summits of 106 46', 

 and having the lateral edges truncated. 



