Ax questions, hard answers.(Letter to the Editor)

From: Science News | Date: April 16, 2005| Author: Burkart, James E.; Goho, A.; Sardina, Joe | Copyright information

Another hypothesis for the polish on the Stone Age corundum ax head is that the Stone Age people never had absolutely pure corundum, which indeed would have required diamond to polish ("In the Buff: Stone Age tools may have derived luster from diamond" SN: 2/19/05, p. 116). It is possible that these people used one grade of corundum to make the ax head and a slightly harder grade to polish it. The difference in hardness would serve the purpose.

JAMES E. BURKART, BETH...

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