Evacuations are underway after Mount Kanlaon in the central Philippines erupted for the second time this year, sending a 4,000-meter ash cloud into the sky and onto nearby towns. Man cuts a drumstick ...

Large crystals found in geodes and other rocks are relatively rare. Pink ChalcedonyA pink chalcedony shows off its beauty. Chalcedonies include many types of cryptocrystalline quartz gems and ...

An image of the rock shows crushed material with yellow crystals, like a geode that’s been smooshed. If you’re reaching to pinch your nose against the rotten-egg smell, don’t worry.

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 ...