PLATE VI. 



PHOTO^riCROGRAPHS OF FLIT)KSrAR BANDS IN ORE BODY AT LEAD HILL. 



A. — Natural light, showing granular outline of original c'alcite particles. 



P,. — Polarized light, showing complete penetration of original calcite (white) 



by lludi'iiic n;)w forming tlnorsjjar (black). 

 C. — Natural light, showing preservation of original bedding plane in clear 



Uuorspar. 



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i 



