sedimentary
Sandstone (Quartz-rich)
Arenite (composed mainly of SiO2)
Hardness: 6-7 (individual sand grains); Color: Tan, brown, or ochre; Luster: Dull or earthy; Texture: Gritty/sandpaper feel; Specific Gravity: 2.2-2.8.
- Hardness
- 6-7 (individual sand grains)
- Color
- Tan, brown, or ochre
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (individual sand grains); Color: Tan, brown, or ochre; Luster: Dull or earthy; Texture: Gritty/sandpaper feel; Specific Gravity: 2.2-2.8.
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, deserts, or marine environments. Age ranges from Precambrian to Holocene.
Uses & applications
Commonly used as a building material, in the manufacturing of glass (if high quartz purity), and as a reservoir rock for oil and natural gas.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The Famous 'Antelope Canyon' in Arizona is carved entirely out of sandstone.
Field identification & locations
Identify by its gritty texture (feels like sandpaper when rubbed) and visible sand grains. Found globally in sedimentary basins. Collectors should look for unique cross-bedding or ripple marks.
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