The story of these glass beads begins with explosive volcanic activity that would have been spectacular to witness. The beads ...

ONE of the world’s most active volcanoes has erupted again in Hawaii, spewing nearly 1,000ft lava jets into the sky. That’s nearly as high as the Eiffel Tower. Footage of the ...

during the natural alteration of volcanic glass and ash, giving the rock a "mudrock-like" aspect." The alteration of the ash due to passage of water induced the precipitation of zeolites ...