sedimentary
Red Sandstone Pebble
Quartzose Sandstone
Hardness of 6-7 on the Mohs scale due to quartz grains; reddish-brown color caused by iron oxide (hematite) cement; dull to earthy luster; clastic crystal structure; specific gravity around 2.2-2.8.
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Physical properties
Hardness of 6-7 on the Mohs scale due to quartz grains; reddish-brown color caused by iron oxide (hematite) cement; dull to earthy luster; clastic crystal structure; specific gravity around 2.2-2.8.
Formation & geological history
Formed from the accumulation, compaction, and cementation of mineral particles or rock fragments, typically in desert, river, or beach environments over millions of years.
Uses & applications
Used locally as decorative gravel, in landscaping, or collected by beachcombers and rockhounds.
Geological facts
The distinctive red color often indicates an arid or semi-arid terrestrial depositional environment where iron minerals oxidized.
Field identification & locations
Identified in the field by its visible sand-sized grains and gritty texture; commonly found in riverbeds, beaches, and sedimentary rock outcrops worldwide.
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