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quartz

1. n. [Geology]

[SiO2]

An abundant rock-forming mineral composed of silicon and oxygen, also called silica. Quartz sand grains are a major constituent of sandstone and other clastic sedimentary rocks.

See: authigenicchertfelsicgranitehydrothermalhydrothermal alterationigneousmineralrocksandsandstonesedimentarysilicasilicate mineral

SEM of authigenic quartz and smectite
SEM of authigenic quartz and smectite.

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