Opal: Mineral information, data and localities.
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
Common Opal: Mineral information, data and localities.
e-Rocks Mineral Auctions
Opal : Properties, Formation, Uses and Deposits » Geology Science
Opal - The Australian Museum
Crystals, Free Full-Text
Opal / (variety - “Opal-AN”) / (variety - “Hyalite Opal”) / (“Blood Vessel Opal”) / Locality - San Luis Potosi, Mexico
Pink Opal: Mineral information, data and localities.
Opal (Common) Gem Guide and Properties Chart
Green Jelly Opal (rare color and locality)
Rare $675,000 opal makes public debut
“Opal-AN”) / (variety - “Hyalite Opal”) / (“Blood Vessel Opal”) / Locality - San Luis Potosi, Mexico
e-Rocks Mineral Auctions
Opal: The mineral Opal (black, white, fire) information and pictures
Opal : Properties, Formation, Uses and Deposits » Geology Science
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por adulto (o preço varia de acordo com o tamanho do grupo)
