sedimentary
Sandstone (Lithic Sandstone / Greywacke)
Sandstone (SiO2 rich clastic sedimentary rock)
Hardness: 6-7 (Mohs scale), Color: Speckled brownish-grey to greenish-tan, Luster: Dull to earthy, Texture: Medium-grained clastic, sand-like gritty feel, Cleavage: None (conchoidal to irregular fracture).
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Speckled brownish-grey to greenish-tan, Luster: Dull to earthy, Texture: Medium-grained clastic, sand-like gritty feel, Cleavage: None (conchoidal to irregular fracture).
Formation & geological history
Formed by the accumulation, compaction, and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, beaches, or shallow marine depositional environments.
Uses & applications
Commonly used as building stone, paving, aggregate in concrete, or landscaping rock. Raw unworked specimens hold low commercial value but are useful for educational purposes.
Geological facts
Sandstone makes up about 10-20% of Earth's sedimentary rocks. Its porosity allows it to act as an important underground reservoir for groundwater and petroleum.
Field identification & locations
Identified by its visible sand grains, gritty paper-like texture, and rounded water-worn pebble shape from stream erosion. Commonly found along rivers, streams, and coastal areas.
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