U. S. GEOLOGICAL SURVEY 
JLLETIN NO. 136 P,_. X 
'4 ' " ?V ^W^~\- 
£*■* 
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APORHYOLITE WITH SPHERULITES IN LAYERS 
From Jim Saunder's farm, Bigham Copper mine district. Five-sevenths natuial size. The details of the 
spherulitic chains are lost in the photograph. 
