Opal: Mineral information, data and localities.
Por um escritor misterioso
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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
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Precious opal (Mezezo area, Ethiopia) 6, Precious opal from…
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por adulto (o preço varia de acordo com o tamanho do grupo)
