EXPLANATION OF PLATES 



xa Pyrite from Lyon Mountain. Orthographic projection showing 



forms: a (loo), o (m), e (210), 5 (321) and n (211) 

 lb Clinographic projection of same 

 2a Quartz from Lyon Mountain. Orthographic projection showing 



forms: m (loio), r (loii), r(404i), z (oiii), s(ii2i),x 



(5161) and q' (lo.i.ii.i) 

 2b CHnographic projection of same 

 3a Hematite from Lyon Mountain. Orthographic projection show- 



ingforms: c (0001), r (loii) and n (2243) 

 3b CHnographic projection of same 

 4a Calcite from Lyoii Mountain, type L Orthographic projection 



showing forms: M (4041) and [x (5491) 

 4b CHnographic projection of same 



