sedimentary
Quartz-rich sandstone
Quartz arenite (likely); predominantly SiO₂ grains cemented by silica, calcite, or iron oxides
AI-generated identification · may be incorrectTan, 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.
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Physical properties
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.
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.
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