Metamorphic rock

Quartzite

Metamorphosed sandstone; non-foliated, with the original quartz grains welded together by additional silica.

In thin section

Interlocking quartz grains.

**Quartzite hand sample and photomicrograph.** Karla Panchuk (2018), CC BY-SA 4.0; Geologian (2011), CC BY-SA 3.0. Source

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More photos and thin sections

Alex Strekeisen: Quartzite

Other metamorphic rocks

Slate · Phyllite · Schist · Gneiss · Amphibolite · Marble · Hornfels · Migmatite

Sources

Panchuk, Physical Geology 10.3: Classification of Metamorphic Rocks