702 



AREHENIUS 



[chap. 25 



Fig. 29. Chlorite. North Pacific abyssal plain. Polarized light; canada balsam. 



Fig. 30. Nontronite (grey) intergrown with manganese oxide minerals (black) in nodule, 

 (white = voids). Noil Tobe, Timor (Danavi Formation). 



