Molten granite formed the Pioneer Mountain Range in southwest Montana about 72-million years ago.As the granite cooled, water ...

While collecting pegmatite crystals, Phelps noticed many of the quartz crystals had formed in cracks that had opened up in the still-forming pegmatite. "You see these pop up and go through the ...

Quartz crystals are piezoelectric, which means they can generate an electric charge when put under mechanical stress, like getting squeezed.

Major often finds himself awed by crystals — an amateur geologist pondering how many millions of years ago magma cooled slowly to form pockets of interlocking quartz inside Paleozoic sandstone.

A 7-foot-tall, 8,000-pound slab of quartz crystals found in the Ouachita Mountains was unveiled last week at the Smithsonian National Museum of Natural History.

The quartz crystals are likely hexagonal in shape, like the much larger geodes we know on Earth, but each one is only one-millionth of a centimeter - so small that 10,000 of the grains could fit ...

Astronomers have found high-altitude clouds formed from quartz crystals on the gas-giant world WASP-17b ...