sedimentary
Red Sandstone Pebble
Sedimentary Quartz Arenite / Arkose
Hardness of 6 to 7 on the Mohs scale (due to quartz grains); reddish-brown color caused by iron oxide (hematite or goethite) cementing; dull to earthy luster; clastic texture with visible or microscopic sand grains rounded by water transport.
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Physical properties
Hardness of 6 to 7 on the Mohs scale (due to quartz grains); reddish-brown color caused by iron oxide (hematite or goethite) cementing; dull to earthy luster; clastic texture with visible or microscopic sand grains rounded by water transport.
Formation & geological history
Formed through the accumulation, compaction, and cementation (lithification) of sand-sized mineral particles, predominantly quartz, often in desert or shallow marine environments over millions of years.
Uses & applications
Commonly used as decorative gravel, landscaping stones, or educational specimens for studying sedimentary geology.
Geological facts
Red sandstones are famous for forming dramatic geological landmarks around the world, such as the structures in Zion National Park and the historic buildings carved into rock in Petra.
Field identification & locations
Found abundantly in riverbeds, lake shores, and beaches where wave or water action has smoothed and rounded the rock. Identified by its granular sandy texture and distinct red coloration.
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