Microscopic view of the surface of silcrete after controlled heat treatment. Click on photograph to return to the description of raw material alteration. Author: Peter Hiscock, Dept. Archaeology and Anthropology, Australian National University. Feedback: peter.hiscock@anu.edu.au. Date Last Modified: Thursday, 1-May-97 URL: http://artalpha.anu.edu.au/web/arc/resources/intro/heata.htm