sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan, brown, yellowish; Luster: Dull, earthy; Structure: Clastic, fine-grained; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan, brown, yellowish
- Luster
- Dull, earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, brown, yellowish; Luster: Dull, earthy; Structure: Clastic, fine-grained; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specific specimen shows rounding typical of water erosion in riverbeds or coastal environments.
Uses & applications
Common sandstone is used in construction and paving. Small weathered pebbles like this are primarily for decorative landscaping or basic geology collections.
Geological facts
Sandstone makes up about 10 to 20 percent of all sedimentary rocks on Earth and is a major reservoir for water, oil, and natural gas due to its porosity.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Commonly found in riverbeds, beaches, and desert basins. Look for layered bedding planes in larger specimens.
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