Tag Archive: geology

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.

The Devil’s Den in Gainesville, Florida, photographed by Indie House Films.


Secrets of the Ocean Floor

Continental drift is common knowledge now, but when the idea was first proposed it was revolutionary. The maps of one of history’s finest cartographers shifted our view of the planet.

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