sedimentary
Sandstone
Sandstone (SiO2 rich)
Hardness 6-7 on Mohs scale, earthy to dull luster, medium-grained sand particles bound by silica or iron oxide, reddish-brown to tan color, granular texture
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Physical properties
Hardness 6-7 on Mohs scale, earthy to dull luster, medium-grained sand particles bound by silica or iron oxide, reddish-brown to tan color, granular texture
Formation & geological history
Formed by the consolidation and cementation of sand-sized mineral grains, predominantly quartz and feldspar, deposited in desert, river, or coastal environments.
Uses & applications
Widely used as a construction building material, paving stone, decorative landscaping rock, and in glass manufacturing.
Geological facts
Reddish sandstone gets its distinctive color from iron oxide (rust) coating the quartz grains. Famous geological formations like Zion National Park and the Grand Canyon feature massive sandstone layers.
Field identification & locations
Identified by its distinctive gritty feel like sandpaper and visible sand grains. Found globally in ancient sedimentary basins, cliffs, and desert areas.
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