pure quartz crystals embedded in Martian rock. This is the first time such crystals have been found on the red planet.

Rocks and crystals on ... a vital part of the Red Planet’s ecosystem. Exactly what happened to the water and why it all dried up, though, is still a big mystery. Quartz is also an excellent ...

Pure quartz, or “rock crystal” from Brazil. Source: Didier Descouens, CC BY-SA 4.0 Pick up a rock almost anywhere on Earth and chances are pretty good that there’s at least some quartz in it.

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 ...