SiO2 [2 is subscript] {quartz}| has crystals and is glassy or milky {rock crystal}, brown {smoky quartz}, black {morion quartz}, citrine, pink {rose quartz}, amethyst, chalcedony, agate, onyx, or jasper.
Physical Sciences>Earth Science>Mineral>Kinds>Silicates>Quartz
5-Earth Science-Mineral-Kinds-Silicates-Quartz
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Date Modified: 2022.0224