Gorgeous Opal Pineapples

Posted on 6 August 2016 by admin

Opal | ?#?Geology? ???????????????????

Formula: SiO2 ? nH2O
Colour: Colorless, white, various
Hardness: 5? – 6?

Opal “Pineapples” – an opal pseudomorph formed by the replacement of glauberite by opal – found only in New South Wales.

photo: Grant Pearson


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