Opinions expressed by Forbes Contributors are their own. David Bressan is a geologist who covers curiosities about Earth. “We were thrilled!” said Dr. David Grant, a researcher at the ...

Like other igneous rocks, the glossy glass originates from molten rock that has been spewed out from the bowels of the Earth via volcanoes ... Because of the lack of crystals in the overall structure, ...

The Marble Caves are natural rock formations with curved walls covered ... and exposed its stone to weathering. Related: Cave of Crystals: The deadly cavern in Mexico dubbed 'the Sistine Chapel ...

Ancient grains of zircon crystals contain evidence suggesting ... allowing the water to seep below the Earth's surface and ...

This reliquary holds a bone fragment purportedly belonging to Saint Sebastian, within a central rock-crystal vessel. Reliquaries—containers constructed to hold relics, typically the bones of saints or ...

Thermochronology allows researchers to estimate the temperature that mineral crystals ... Snowball Earth. "The underlying concept is pretty simple: Something removed a whole lot of rock, resulting ...