quartz

One of the most common minerals in the Earth’s crust (and in some new-age boutiques). Made up of silicon dioxide (SiO2),lso called silica. Commonly in white masses. Crystals are clear, glassy 6-sided prisms.

quartzite

A nonfoliated metamorphic rock formed from pure, dominantly quartz sandstone.

quartzite

Hard, somewhat glassy-looking rock made up almost entirely of quartz. Metamorphosed quartz sandstone and chert are quartzites.

Quaternary

The most recent Period of the Cenozoic Era. Encompasses the time interval of 1.6 million years ago through today.

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