BULL. DEPT. GEOL. UNIV. CAL. VOL. I. PL. 4. 



7 



6 



1. Cleavage Fragment of Iddingsite. 



2, 5, 4, 5. Sections of Iddingsite Parallel to the Cleavage and 

 Perpendicular to the Acute Bisectrix, a 



6, 7,8. Sections cf Iddingsite Approximately Farallel to the 



Basal Pinacoid, (001), Showing Cleavages and Cracks. In 8 the 



Heavy Border Represents a Peripheral Wreath of Green Ser- 

 pentinous Matter. 



