sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (composed primarily of SiO2)
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None (breaks across grains); Specific gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale if quartz-rich)
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None (breaks across grains); Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears weathered/water-worn, indicating transport by water or wind before lithification.
Uses & applications
Commonly used in construction for building stone, road base, or crushed stone. Highly pure quartz sandstone is used in glass manufacturing.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. It often contains significant aquifers and petroleum reservoirs due to its porosity.
Field identification & locations
Identify in the field by its 'gritty' feel (like sandpaper) and visible sand grains. This specific piece has a flat, elongated shape likely smoothed by fluvial (river) or coastal erosion.
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