﻿Pig. 10. — Strings of native silver in galena, following the cleavage 

 planes of the galena crystals : Nentsbury Mine, Alston* 

 (Reflected light : X 200.) 





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Pig. 11. — Strings of native silver in galena : Foxdale Mine, 

 Isle of Man. (Reflected light : x 400.) 



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