Fig. 2 Photomicrographs. Pseudomorphs after biotite in saprolite and soils of central Virginia. (1) C4 saprock sheared biotite. (2) C4 saprolite. Kaolinite pseudomorph after biotite. Under crossed polarizers. (3) M2 saprolite. Biotite–vermiculite–kaolinite–gibbsite pseudomorph. (4) M2 saprolite. Gibbsite and kaolinite pseudomorph after biotite. Under crossed polarizers