sedimentary
Sandstone (Weathered Pebble)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (Mohs scale); Color: Pale grey-green with tan weathering; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Pale grey-green with tan weathering
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Pale grey-green with tan weathering; 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 sand-sized mineral grains or rock fragments. This specimen shows significant rounding from water transport, likely in a river or glacial environment.
Uses & applications
Common sandstone is used in construction and as road base. Small weathered pebbles like this are primarily collected as decorative gravel or for hobbyist tumbling.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum deposits due to its porosity.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible grains under a hand lens. Commonly found in river beds, beaches, and sedimentary basins.
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