sedimentary
Sandstone / Chert Gravel
SiO2 (Silicon Dioxide based clastic sedimentary rock)
Mohs hardness 6 to 7, brownish-tan to yellowish-brown earthy color, dull to sub-vitreous luster, fine-grained to medium-grained texture, granular fracture.
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Physical properties
Mohs hardness 6 to 7, brownish-tan to yellowish-brown earthy color, dull to sub-vitreous luster, fine-grained to medium-grained texture, granular fracture.
Formation & geological history
Formed by the compaction and cementation of sand-sized grains of quartz and other minerals in ancient riverbeds, lakes, or marine environments.
Uses & applications
Commonly used as construction aggregate, land gravel, landscaping rock, or road base material.
Geological facts
Sandstone can retain preserved ripples from ancient currents and wind dunes, offering a geological snapshot of pre-historic landscapes.
Field identification & locations
Can be identified in the field by its gritty texture and earthy tan or brown coloration. Extremely common worldwide in sedimentary rock layers, riverbeds, and gravel pits.
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