sedimentary
Sandstone (Weathered Pebble)
Arenite (primarily SiO2)
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or earthy; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); Cleavage: None; Specific gravity: 2.2 - 2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Tan, brown, or earthy
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Tan, brown, or earthy; Luster: Dull/Earthy; Crystal structure: Clastic (grainy texture); 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 specific specimen shows signs of fluvial (river) or glacial weathering, resulting in its rounded, smooth shape.
Uses & applications
Used widely in construction as a building stone, in road base, and as a raw material for glass manufacturing. In a weathered state like this, it is common as decorative landscaping gravel.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks in the Earth's crust. It is a major reservoir for water (aquifers) and oil/gas due to its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible grains. It can be found globally in riverbeds, beaches, and desert outcrops. For collectors, it is usually found as common gravel.
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