sedimentary
Sandstone (likely with Quartz Veining)
Arenite (primarily SiO2)
Hardness: 6-7 (Mohs scale); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2–2.8
- Hardness
- 6-7 (Mohs scale)
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2–2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) of sand size. This specimen displays quartz veining, suggesting later hydrothermal activity where mineral-rich water filled fractures.
Uses & applications
Used widely in construction as a building stone, in the manufacture of glass, and as decorative landscaping stone.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. It is a major reservoir for groundwater and petroleum because of its porosity.
Field identification & locations
Identify by its gritty texture (feels like sandpaper). Look for layering (bedding planes) and check for hardness; it should be able to scratch glass if quartz-rich. Common in desert environments and ancient riverbeds.
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