Plate 5 



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Figure I Oolitic ore showing typical spherules, but their concentric struct- 

 ure masked by the opacity of the hematite. Magnified 30 diameters 



Figure 2 Minette ore of Lorraine. The spherules are much smaller 

 than those of the Clinton ore and lack the quartz cores, but have similar 

 concentric structure. Magnified 57 diameters 



