Opal: Mineral information, data and localities.

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 - Wikipedia

Opal: Mineral information, data and localities.

e-Rocks Mineral Auctions

Opal-C: Mineral information, data and localities.

Opal, Peruvian Blue - Peruvian Blue Opal is a mystical dream the earth has blessed us with. The energy can vary depending on its locality when dealing

Blue Opal - Andean, Rough

Yellow Opal (rare locality) Opal occurrence, Cercle de Nioro du Sahel, Kayes Region, Mali

Opal: The mineral Opal (black, white, fire) information and pictures

Opal: Mineral information, data and localities.

Opal : Properties, Formation, Uses and Deposits » Geology Science

Map showing distribution of opal bearing localities in Western Queensland [cartographic material] / - Catalogue

File:Precious opal in basalt (Honduras) 2.jpg - Wikimedia Commons

Polished Complex Wispy Green Opal Standing Free Forms x 3 From Antsirabe, Madagascar

Opal : Properties, Formation, Uses and Deposits » Geology Science