ON THE PRIMITIVE FORMS OF CRYSTALS. 6l 



ving been able to discover whether they have one 

 or two axes. By this property, therefore, they are 

 excluded from the three primitive forms of the Cube, 

 the Regular Octohedron, and the Bhomboidal Do- 

 decahedron ; and therefore they must belong either 

 to the first or second class of primitive forms. 



Table containing Crystals that must belong either 

 to the 1st or I Id Class of Primitive Forms, 



Acetate of nickel. 



Euclase. \ 



Pycnite. 



Chlorite. 

 5 Cubizite. 



Native orpiment. 



Actynolite. 



Harmotome. 



Made. 

 10 Wavellite. 



Calamine. 



Anthophyllite. 



Laumonite. 



Asbestos. 

 15 Serpentine. 



Steatite. 



Tabular spar. 



Cryolite. 



Carbonate of copper. 



