BULL. GEOL. SOC. AM. 



VOL. 14, 1902, PL. 46 



Figure 1, — Madupite from Pilot Mesa 

 Groundmass is of glass; rods are diopside ; black dots are pei'ofshite. Actual field, 1 millimeter 



FhiURK 2.— Madupite khom Pilot Mesa 

 Jje^:cription of minerals the same as in tii^ure 1. Actual fieKl, 1.5 millinietei 



MADUPITE FROM PILOT MESA 



