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
Polished Green Opal Standing Free Form x 12 From Antsirabe, Madagascar
Opal-C: Mineral information, data and localities.
Opal: Mineral information, data and localities.
Opal : Properties, Formation, Uses and Deposits » Geology Science
Rare $675,000 opal makes public debut
Crystal Opal: Mineral information, data and localities.
Boulder opal
Yellow Opal (rare locality) Opal occurrence, Cercle de Nioro du Sahel, Kayes Region, Mali
Onyx Opal: Mineral information, data and localities.
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