ON THE PRIMITIVE FORM OF CRYSTALS. 347 



Tabular Spar. Euclase. 



Cymophane. Red oxide of Zinc. 



Axinite. Tantalite. 



Peridote. Oxide of Manganese. 



Essonite. Sulphur. 



Staurotide. Muriate of Copper. 



Sphene. Wavellite. 



Tessular System. 



Muriate of Soda. 



Muriate of Ammonia. 



Diamond. 



Boracite. 



Garnet. 



Arseniate of Iron. 



Helvin. 



Aplome. 



Spinelle. 



Ceylanite. 



Alum. 



Fluor-Spar. 



Blende. 



Sodalite. 



Ruby Copper. 



When we examine the determinations contained 

 in the preceding Table, we cannot but be struck 

 with the coincidence which almost universally ob- 

 tains between Mohs's results and those which I 

 have deduced from the optical structure of minerals. 

 No fewer than nine out of the eleven minerals 

 which constitute the exceptions to Haiiy's Table, 

 (see page 344.), have been found by Mohs to have 

 the same primitive forms which I assigned to them ; 

 and the other two minerals, namely, Iolite and 



