BULL. GEOL. SOC. AM. 



VOL. 14, 1902. PL. 42 



Figure 1. — Wyomingite from South Table 



Round white minerals are leucite; small dark rods diopside : large crystals, phlogophite. The 

 apparent groundmass is largeh' phlogophite charged with leucites. Actual field, 1 millimeter 



i 

 i 



Figure 2. — Coarse WyoiMixgite fro:m riir. Badokrs Tf.ktii and ciiauactf.ristic of the Dikes 



Round white minerals are leucite; rods are diopside; large elliptical mineral is phlogopliite ; 

 dark groundmass is yellowish glass. Actual fielil, 1 milliiuotcr. Locality, Badgers Teeth 



PHOTOMICROGRAPHS OF WYOMINGITE 



