sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 on Mohs scale (quartz grains); Color: Tan, reddish-pink, or light orange due to iron oxide staining; Luster: Dull to earthy; Structure: Granular, clastic texture with visible sand-sized grains; Cleavage: None.
- Hardness
- 6-7 on Mohs scale (quartz grains)
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale (quartz grains); Color: Tan, reddish-pink, or light orange due to iron oxide staining; Luster: Dull to earthy; Structure: Granular, clastic texture with visible sand-sized grains; Cleavage: None.
Formation & geological history
Formed from the accumulation and cementation of mineral grains or rock fragments. This specific specimen’s rounded shape suggests a history of water transport and erosion in a riverbed, beach, or desert environment over millions of years.
Uses & applications
Used widely as a building material, for paving, in the manufacture of glass (if high quartz purity), and as decorative landscaping stones.
Geological facts
Sandstone is one of the most common types of sedimentary rock and often acts as a natural aquifer for storing water or a reservoir for oil and gas because of its porosity.
Field identification & locations
Identify in the field by its 'sandpaper' feel and visible granular texture. If you hit it with a hammer, it may break into its component sand grains. Found globally in basins and coastal areas.
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