ON THE PRIMITIVE FORM OF CRYSTALS. 



First class of primitive forms, 

 crystals with one axis. 



1. Rhomboid with obtuse Summit, 



Carbonate of Lime. 



Carbonate of Lime and Magnesia 



Carbonate of Lime and Iron. 



Carbonate of Manganese. 



Tourmaline. 



Rubellite. 



Ruby Silver. 



2. Rhomboid with acute summit 



Corundum. 



Sapphire. 



Ruby. 



Cinnabar. 



3. Regular Heocahedral Prism, 



Emerald. 

 Beryl. 



Phosphate of Lime. 

 Nepheline. 

 Arseniate of Copper. 



4. Octohedron with a Square Base. 



Zircon. 

 Mellite, 



