Opal - Mineral Specimen prehistoric coral The smaller gem stones get

The smaller gem stones get

showcases vibrant

Its color comes from trace amounts of iron trapped in the crystal

they built new chambers onto them

approximately 82 to 66 million years ago

Opal - Mineral Specimen prehistoric coral The smaller gem stones getMined 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,