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phorbin

In article , boat042-
says...

Chipping and cracking was first on my mind as well. But how? In normal or
even extreme use, how or what will cause it to chip or crack? Just how tough
or fragile is this stuff? It's only a matter of time before the woodworking
magazines bombard one with ball bearings and bowling balls. I'll sit on the
fence until then.

Percussion?

In art school I bounced a hammer off a granite tile once 2'x2'x2" and
the thing cracked as if I'd kung fu'd it.