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Glossary

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Quadrangle

A rectangular area bounded by parallels of latitude and meridians of longitude. In this database, “quadrangle” means a USGS 7.5-minute topographic quadrangle map, 1:24,000 scale.

Quartz

A very common rock-forming mineral consisting of silicon dioxide.

Quartzite

A granular metamorphic rock derived from sandstone and consisting of interlocking grains of quartz.