sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: Red-brown to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Red-brown to tan, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and lithification of sand-sized mineral particles or rock fragments. Typically deposited in desert, river, or coastal environments over millions of years.
Uses & applications
Commonly used as a building material, decorative stone, in construction aggregates, and for making glass or abrasives.
Geological facts
Red sandstone gets its color from iron oxide (hematite) coating the sand grains. Many famous landmarks like the Grand Canyon or the 'Red Rocks' of Colorado are composed of sandstone.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and visible grains. It is extremely common in dry regions and can be found in sedimentary basins globally.
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