sedimentary
Sandstone pebble
Sandstone (siliciclastic sedimentary rock)
Hardness 6-7 on Mohs scale depending on cementation; grayish-tan to light brownish color; dull to earthy luster; clastic texture with fine to medium sand grains visible; poor cleavage.
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Physical properties
Hardness 6-7 on Mohs scale depending on cementation; grayish-tan to light brownish color; dull to earthy luster; clastic texture with fine to medium sand grains visible; poor cleavage.
Formation & geological history
Formed through the compaction and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, beaches, or desert environments, followed by transport and rounding by water.
Uses & applications
Commonly used in construction, aggregate for concrete, landscape decoration, and road base material.
Geological facts
Sandstones make up roughly 20 percent of all sedimentary rocks on Earth and frequently host underground aquifers and petroleum reservoirs due to their porosity.
Field identification & locations
Identified in the field by its gritty texture (feels like sandpaper when rubbed) and visible sand grains. Found worldwide along riverbeds, beaches, and eroded sedimentary beds.
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