EXPLANATION OF PLATES 



I'd Pyrite from Lyon Mountain. Orthographic projection showing 

 forms: a (ioo), o (in), e (210), 5 (321) and n (211) 



ib Clinographic projection of same 



2a Quartz from Lyon Mountain. Orthographic projection showing 

 forms: m (1010), r (ion), 1X4041), z (0111), s(ii2i),# 

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



2b Clinographic projection of same 



3a Hematite from Lyon Mountain. Orthographic projection show- 

 ing forms: c (0001), r (ion) and n (2243) 



3b Clinographic projection of same 



4a Calcite from Lyon Mountain, type I. Orthographic projection 

 showing forms: M (4041) and /a (5491) 



4b Clinographic projection of same 



