TrekGEO > Mineral Trail > Oversea > Opal

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Old Timers Mine

Crowders Gully road, Coober Pedy, South Australia state, Australia

IMA approved name

Opal pseudomorph after bivalvia


Length of the left specimen: 15 mm. Opal pseudomorph after shell fossil. The translucent white part is opal replacing bivalvia fossil.

Recovered from the weathered part of shale deposited in a shallow marine environment and subjected to diagenesis.

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