sedimentary
Sandstone (with Quartz veining)
Arenite (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Grey, tan, buff with white quartz veins; Luster: Dull to earthy (matrix), Vitreous (veins); Structure: Granular/Clastic; Cleavage: None.
- Hardness
- 6-7 on Mohs scale
- Color
- Grey, tan, buff with white quartz veins
- Luster
- Dull to earthy (matrix), Vitreous (veins)
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Grey, tan, buff with white quartz veins; Luster: Dull to earthy (matrix), Vitreous (veins); Structure: Granular/Clastic; Cleavage: None.
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size, typically in marine or desert environments. This specimen features secondary quartz veining formed by hydrothermal fluids filling fractures.
Uses & applications
Commonly used in construction, paving, landscaping, and as an architectural decorative stone. It is also a significant reservoir rock for oil and groundwater.
Geological facts
Sandstone makes up about 10-20% of all sedimentary rocks on Earth. The white lines visible are 'veins' created when the rock cracked and silica-rich water crystallized within the gaps.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layers or bedding. Frequently found in canyon walls, riverbeds, and mountainous regions worldwide.
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