Opal: Mineral information, data and localities.
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Although it is still (2007) regarded as a mineral species for historical reasons, opal is not a true mineral in the accepted sense of the word as it is
Pink Opal: Mineral information, data and localities.
File:Precious opal in basalt (Honduras) 2.jpg - Wikimedia Commons
Representative chemical analyses of opal-associated minerals from the
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Association between opal occurrences and soil type and regolith type
Onyx Opal: Mineral information, data and localities.
Fire Opal: Mineral information, data and localities.
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Minerals, Free Full-Text
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