sedimentary
Sandstone with Quarzite clasts
Arenite (SiO2 based)
Hardness: 6-7 (Mohs scale), Color: Tan to yellowish-brown with grey inclusions, 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: Tan to yellowish-brown with grey inclusions, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in river, lake, or ocean beds. This specific specimen shows weathering typical of surface-exposed sedimentary rock.
Uses & applications
Primarily used as construction material, road base, and in glass manufacturing if high in silica. Small weathered pieces are mainly of interest to student collectors.
Geological facts
Sandstone represents about 20 to 25 percent of all sedimentary rocks in the Earth's crust. It is a major reservoir for groundwater and petroleum.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Often found in outcrops, riverbeds, and basins. Collectors should look for unique banding or fossil inclusions.
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