sedimentary
Sandstone (Quartzite-rich Pebble)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale), Color: Tan to light brown, Luster: Dull/Earthy, Crystal Structure: Microcrystalline quartz grains, Cleavage: None (conchoidal fracture when broken), Specific Gravity: 2.6-2.7
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan to light brown, Luster: Dull/Earthy, Crystal Structure: Microcrystalline quartz grains, Cleavage: None (conchoidal fracture when broken), Specific Gravity: 2.6-2.7
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears water-worn, likely shaped by river or coastal erosion over millions of years (various geological ages).
Uses & applications
Used in construction as an aggregate, in landscaping, and sometimes as a source of silica for glass manufacturing. Well-rounded pebbles are often used decoratively in gardens or aquariums.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The smooth, rounded shape indicates it has traveled a long distance from its source through water transport.
Field identification & locations
Identify by its gritty texture (like sandpaper) and 'salt and pepper' appearance under a magnifying glass. Commonly found in riverbeds, beaches, and desert basins. Not a rare specimen.
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