sedimentary
Weathered sandstone fragment
Sandstone, likely ferruginous quartz arenite or arkose
AI-generated identification · may be incorrectFine- to medium-grained, reddish-brown, dull to earthy luster, with visible sand-sized grains and apparent iron-oxide cement; hardness about 6–7 for quartz grains, but the rock may crumble, and bedding/cleavage are not evident.
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Physical properties
Fine- to medium-grained, reddish-brown, dull to earthy luster, with visible sand-sized grains and apparent iron-oxide cement; hardness about 6–7 for quartz grains, but the rock may crumble, and bedding/cleavage are not evident.
Formation & geological history
Lithified sand compacted and cemented by silica, carbonate, or iron oxides, commonly in river, dune, or shallow-marine settings; its exact geologic age cannot be determined from the photograph.
Uses & applications
Used as building stone, paving, masonry, and aggregate; attractive red varieties are also collected or used decoratively.
Geological facts
The rusty color typically reflects hematite or limonite coatings on quartz and feldspar grains. The pointed shape appears naturally weathered or manually broken.
Field identification & locations
Identify by gritty texture, sand grains, lack of glassy crystals, and scratching glass if quartz-rich; common worldwide, especially in arid basins and sedimentary formations.
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