sedimentary
Sandstone Cobble
Clastic Sedimentary (Sandstone)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Specific gravity: 2.2–2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, or brownish-grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, or brownish-grey; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Specific gravity: 2.2–2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually size-matched as 'sand'. This particular specimen is a 'cobble' or 'river rock' shaped by fluvial erosion over hundreds to thousands of years.
Uses & applications
Commonly used in construction, landscaping, road base, and as decorative garden stones. Larger deposits of sandstone are used as dimension stone for buildings.
Geological facts
Sandstone preserves a record of ancient environments like deserts or riverbeds. The rounded shape (sphericity) of this specimen indicates it has traveled a long distance in a high-energy water environment like a river or shoreline.
Field identification & locations
Identify in the field by its gritty, sandpaper-like texture and rounded, smooth edges. Commonly found in riverbeds, glacial deposits, and coastal regions. It is very common worldwide.
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