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This parcel is Seam opal from Lightning Ridge Australia.
This material is being sold as specimens.
These are great examples of how the opal forms in the fine cracks and voids
In some cases impregnating the stone/clay and opalising it.
This can give it the appearance of matrix type opal formation.
Pale base colours.

Wetted to bring out colours
Rule in Millimeters
Measurements are generally rounded down and approximate

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