Chemistry

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Crystals

By Anne Marie Helmenstine, Ph.D., About.com Guide

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Gallery Index
Crystals of amethyst from Brazil.

Amethyst is purple quartz, which is silicon dioxide. The color may derive from manganese or ferric thiocyanate.

Nasir Khan, morguefile.com
The Crystals Photo Gallery shows crystals you can grow yourself as well as crystals of minerals, liquid crystals, proteins, and other molecules.

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