sedimentary
Sandstone Pebble
Arenite (primarily Quartz, SiO2)
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, yellowish-brown
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, yellowish-brown; Luster: Dull/Earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears water-worn, suggesting a fluvial (river) or coastal environment where it was smoothed by abrasion.
Uses & applications
In this small pebble form, it is primarily a decorative garden stone or a river rock. Large sandstone deposits are used widely in construction for paving, building facades, and as abrasive material.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. Its porosity makes it an important aquifer for storing groundwater and a reservoir for petroleum.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds, beaches, and sedimentary basins worldwide. Collectors look for unique banding or 'Liesegang rings'.
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