de Broekert: Stratigraphy and origin of regolith, SW Yilgarn Craton 
Weathered granite lithofacies 
(composite section) 
5-1 Om 
1-5m 
" Q,K,f,mica 
. * # +. 
f- + • 
+ * 
* >; 
-L. 
t Q.F 
•f 1 v — 
,mica,k 
Q.F.mica 
Q,K,(mica) 
Figure 4. Composite stratigraphic section of weathered granite lithofacies with representative optical photomicrographs. A: Fresh 
granite. B: Lower saprolite. C: Upper saprolite. Inset in C shows enlarged view of vermiform books of kaolinite, which are optimally 
developed within the upper saprolite. Dominant minerals are quartz (Q), kaolin (K), biotite (B), microcline (M), plagioclase (P), and 
sericite (S). A = sample EY48/1, B = sample YN42 20.1 m, C = sample YN41 11.4 m; all cross-polarized light. 
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