Fig. 22 Photomicrograph of foot-wall, Stella mine. Feldspar altering to green 

 chlorite, which also fills cavities in lower part of pyrite. The latter has developed 

 in slender, parallel tongues, between which sericite has formed. Pyrite is also shown 

 in bleached mica and orthoclase. (Magnified 83.5 diameters) 



Fig. 2S Photomicrograph of pyritiferous pegmatite from foot-wall, Stella mine. 

 Skeletal growth of pyrite in chlorite, which latter has developed chiefly at the expense 

 of feldspar. (Magnified 27.5 diameters) 



