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Date: July 03, 2004 at 02:18:26
From: Mr. Yoshiyuki Mochizuki, [dsl-201-128-215-178.prod-infinitum.com.mx]
Subject: Re: Mexican Black Opal?


This can be a "TIZATE" which is a natural mexican white opal that changes color when heated. It is really light weighted. You can test very easily if it is a "TIZATE", first test is to lick the stone and stick it to your forehead, if it sticks then it is a "TIZATE", second test is to see thru it, almost all black opals will be translucent but this stone will not be translucent.
Also it could be a platic imitation from KYOCERA OPALS. These are really easy to determine. The flash patches are to regular to be truth. I hope this will help you out.


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