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.
Quartz {agate}| can have different color bands.
Quartz {amethyst}| can be violet.
Quartz {chalcedony} can have translucent microcrystals.
Quartz {citrine} can be yellow.
Quartz {jasper} can be many-colored.
Quartz {onyx}| can have straight black-and-white bands.
5-Earth Science-Mineral-Kinds-Silicates
Outline of Knowledge Database Home Page
Description of Outline of Knowledge Database
Date Modified: 2022.0225