IT is well known that authigenic orthoclase is present in fossil sediments of marine origin. In the course of my studies of fragments from gabbro and anorthosites in a core taken in 1948 by the ...

Ever wonder how Earth scientists examine rocks? We cut them up and throw them under a microscope ... and then everything seems different. To many people, a rock is just a rock. If anyone has been ...

As NASA’s MAVEN mission heads toward Mars, scientists say they’ve discovered highly unusual, light-colored rock on the mostly dark-toned Red Planet – and two teams have dueling ideas of what such pale ...