The 75-year-old letter was written by a coal miner who said that this mineral was mined at that time from a site in Germany.

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 ...

Curiosity found a field of similar light-toned ... the rover had crushed a similar-looking rock and revealed sulfur crystals. Curiosity is a rolling laboratory with drilling capabilities, but ...

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 ...

Evidence for the use of rock crystal - a rare type of perfectly transparent quartz which forms in large hexagonal gems - has occasionally been found at prehistoric sites in the British Isles, but ...

There's only one way to get the crystals, fossils, and metals, and that's by digging up rocks found in the world. These rocks can be found in any world, outside on the ground. Once you find a rock ...