BULL. GEOL. SOC. AM. 



VOL. 16, 1804, PL. 79 



Figure 1. — Section of Serpentine, U. S Company, Pit Number 3 

 Showing parallel fibrous structure 



Figure 2. — Serpentine and Asbestos Vein (Section 90) 



Showing the sharp line of contact and a tendency to shearing at the extremity of the 



fiber band 



PHOTOMICROGRAPHS OF SERPENTINE 



