Opal gets it name from Sanskrit work "upala" means "jewel" and also from the Greek word "Opallios" meaning "to see a change in color"
Mineraloid
5.5-6
Opal is famously known in the region of Australia and Ethiopia
Boulder opal contains patches of opal surrounded by host rock which is either a ironstone or sandstone
The Fire Opal from Mexico may exhibit "play of color" with green flashes
The Ethiopian Opal from the Wollo province has a body color of clear, white, yellow, orange, or brown with amazing play of colors
Black Opal from Australia has brilliant play of colors with black background
Brazilian Opal, Crystal Opal
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