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Boulder Opal from Central Queensland.
A seam of opal running across the face of a piece of ironstone.
Two pieces of koroit material with matrix opal infusing it
and another piece of koroit with seams running through the stone.

The pieces are wet to bring out their colours.
The Ruler is measured in millimetres.
Measurements are generally rounded down and approximate.

Colour: Please note the camera has been white-balanced to give truer colours NO Photo Shopped enhancement.