sedimentary
Sandstone Pebble
Arenite (specifically Lithic or Quartz Arenite)
Hardness: 6-7 Mohs; Color: Tan to light brown with dark speckles; Luster: Dull/Earthy; Crystal structure: Clastic (visible sand grains); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 Mohs
- Color
- Tan to light brown with dark speckles
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan to light brown with dark speckles; Luster: Dull/Earthy; Crystal structure: Clastic (visible sand 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 over millions of years. This specific specimen has been water-worn into a smooth, oval pebble shape by river or coastal erosion.
Uses & applications
Used primarily as a decorative stone in landscaping, or as a source of quartz for construction sand and glass manufacturing when found in large deposits.
Geological facts
Sandstone records history in its layers; it often preserves ripple marks from ancient seabeds or cross-bedding from desert dunes. It is one of the most common sedimentary rocks on Earth's crust.
Field identification & locations
Identified in the field by its gritty texture (feels like sandpaper) and visible grains. It is commonly found in riverbeds, beaches, and sedimentary basins worldwide.
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