Opal specimen, boulder opal on white background

© Greg C Grace

Caption Details

Opal specimen, boulder opal on white background

Opal is hydrated silica which may contain around 2 to 10 percent. Opal comes in many colours from milky white - through vivid blues and greens to precious black opal which is highly prized. Fire opal is a also found, which ranges from bright golden yellow to rich red-orange. Opals hardness is between 5.5 and 6.

Photo ID #540657

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Digital Image
Digital High Res
300 dpi@ A3

Model Release Available: No
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