Quartz is a crystal formed from silicon and oxygen with a chemical composition of SiO2. Most quartz forms when magma cools. As it cools, the silicon dioxide crystalizes, analogous to how cooling ...

Quartz, fluorite, topaz, gold, galena, pyrite and chalcopyrite formed deep in the Earth at temperatures between 300 and 500 degrees Celsius.

Scientists discovered silica mineral quartz in a primitive meteorite, becoming the first in the world to present direct evidence of silica condensation within the solar protoplanetary disk. They ...