sedimentary
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish due to iron oxide; Luster: Dull/Earthy; Texture: Granular (feels like sandpaper); Porosity: High.
- Hardness
- 6-7 (Mohs scale)
- Color
- Brown, tan, reddish due to iron oxide
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Brown, tan, reddish due to iron oxide; Luster: Dull/Earthy; Texture: Granular (feels like sandpaper); Porosity: High.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, deserts, or marine environments over millions of years.
Uses & applications
Used widely in construction for building stone, pavers, and as decorative landscaping rock. High-purity sandstone is used in glass manufacturing.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It is a vital reservoir rock for groundwater, oil, and natural gas due to its high porosity and permeability.
Field identification & locations
Identify by its gritty texture and visible sand grains. It common in canyon lands and river valleys. For collectors, look for ripple marks or cross-bedding indicating ancient water or wind flow.
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Sandstone
Arenite (primarily SiO2)
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