sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
Hardness: 6-7 Mohs; Color: Tan, beige, off-white; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.3-2.4
- Hardness
- 6-7 Mohs
- Color
- Tan, beige, off-white
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs; Color: Tan, beige, off-white; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.3-2.4
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (detritus). This specific specimen shows signs of fluvial or coastal erosion, giving it a rounded, water-worn shape.
Uses & applications
Commonly used in construction, as a paving material, and in glass manufacturing if silica content is high. Also used as a decorative stone in landscaping.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth. The 'hole' or indentation seen in this specimen likely formed from differential weathering, where a softer mineral inclusion or a fossil was eroded away faster than the surrounding matrix.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins, riverbeds, and beaches. Collectors look for unique shapes caused by natural erosion.
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Sandstone
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