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Though modest in size
When held up to the light
Its color comes from trace amounts of iron trapped in the crystal
The smaller gem stones get
approximately 82 to 66 million years ago
Opal - Mineral Specimen prehistoric coral Though modest in sizeMined from: Coober Pedy, South Australia, Australia Description: This Australian opal specimen is presented in rough form within its natural host rock, showing pale grey to milky translucent opal along the edges with a soft waxy luster. The silica contrasts against a light, porous sandstone matrix, with iron rich staining creating subtle orange and reddish patches throughout. The opal itself shows conchoidal fracture surfaces and internal cloudiness,