sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: Cream, tan, or light gray with brownish banding; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Cream, tan, or light gray with brownish banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Cream, tan, or light gray with brownish banding; Luster: Dull/Earthy; Crystal structure: Clastic (granular texture); Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized silicate grains (mostly quartz). These often form in riverbeds, deserts, or coastal environments. This specific specimen appears to be waterworn, likely from a river or beach environment.
Uses & applications
Commonly used as a building material, in glass manufacturing (if high purity quartz), as decorative landscaping stones, and for ornamental carving.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. The visible bands (laminae) inside the stone represent different depositional events or changes in mineral content during its formation.
Field identification & locations
Identify by its 'sandpaper' feel and visible grains. It can be found globally in outcrop formations or as rounded pebbles in fluvial/coastal deposits. Testing with dilute HCl will distinguish it from limestone (it won't fizz unless it has a calcitic cement).
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