Tag Archive: geology


This is lightning ridge black opal.

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The world’s largest free-form black opal weighs 6,000 carats.

An opal geode.

An Oregon conta luz opal.

The volcano Fuego in Guatemala, mid-eruption.

A slice of fossilized tree with opal growth in the rings.

This is the Richat Structure seen from the ISS. It’s in Mauritania, in the Sahara desert. Photo by Dutch astronaut Andre Kuipers.

An Ethiopian welo opal. Looks like an underwater scene.

Another Ethiopian opal.

An Ethiopian opal geode.

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