CLASS II. ORDERS. 399 



XII. ORDER. BLENDE. 



Streak green, red, brown, uncoloured. 

 H. = 1-0 ... 4-0. 

 G. = 3-9 ... 8-2. 



Metallic : colour black. 



Non-metallic : lustre adamantine. 



Streak green : colour black. 



Streak brown ... uncoloured : G. between 

 4-0 and 4-2, form tessular. 



Streak red : H. = 2-5 and less. 



G. = 4-3 and more : streak red. 



XIII. ORDER. SULPHUR. 



Non-metallic. 



Colour yellow, red, brown. 



Prismatic. 



H. = 1-0 ... 2-5. 



G. = 1-9 ... 3-6. 



Cleavage monotomous : G. = 3*4 and more, 

 G. above ! : streak yellow or red 



