sedimentary

Quartz-rich sandstone

Quartz arenite (likely); predominantly SiO₂ grains cemented by silica, calcite, or iron oxides

AI-generated identification · may be incorrect

Tan, coarse-grained, and granular with a dull to slightly sparkly surface; mainly quartz (Mohs 7) with possible feldspar and iron-oxide staining. Individual crystal structure is not readily visible; hardness and cleavage of the whole rock vary with cementation.

Identified September 27, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when sand is deposited, compacted, and cemented, commonly in rivers, beaches, or deserts. The image cannot establish its geological age or exact cement.

Uses & applications

Used as building or landscaping stone and, when sufficiently quartz-rich, as a source of silica; also collected as a common specimen.

Geological facts

Sandstone’s grains and cement can vary considerably, even when specimens look similar.

Field identification & locations

Identify by visible sand-sized grains and a gritty texture; quartz-rich grains resist scratching by a steel knife. Sandstone occurs worldwide in sedimentary basins.