Spectacular Opal From Australia

Spectacular Opal From Australia
Spectacular Opal From Australia. Copyright © JJ Harrison.
From the Willems Miner Collection


Opal


Although it is still  regarded as a valid mineral species for historical reasons, Opal is not a true mineral in the accepted sense of the word as it is either composed of Cristobalite and/or Tridymite or composed of amorphous silica.

From Yowah, Queensland, Australia




 
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