sedimentary
Sandstone (Quartzite Pebble)
Arenite / Metamorphosed Sandstone (SiO2)
Hardness: 6-7 on Mohs scale; Color: Grey to brownish-grey; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.6-2.7
- Hardness
- 6-7 on Mohs scale
- Color
- Grey to brownish-grey
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Grey to brownish-grey; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.6-2.7
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specific specimen appears to be a river-worn pebble, likely originating from many millions of years of erosion and transport.
Uses & applications
Common sandstone is used in construction and road base. As a small river pebble, its primary value is as a decorative landscaping element or a common geological sample.
Geological facts
Sandstone records historical environmental changes; the cross-bedding often found in larger formations can tell geologists the direction of ancient winds or water currents.
Field identification & locations
Can be identified by its gritty, sandpaper-like texture and its ability to scratch glass if it is quartz-rich. Found globally in riverbeds, beaches, and desert outcrops.
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