103 
c. 
Microphotographs oi aggregates of wedge-shaped colerainite crystals; Standaid asbestos 
mine. Note lines parallel to the base of the wedges. (Page 67.) 
A. Magnified 50 diameters, natural light. 
B. Magnified 50 diameters, polarized light. 
C. Magnified 100 d'ameters, polarized light. 
y 
