Opal: Mineral information, data and localities.

Por um escritor misterioso

Descrição

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
Opal: Mineral information, data and localities.
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Opal: Mineral information, data and localities.
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Opal: Mineral information, data and localities.
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Opal: Mineral information, data and localities.
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