sedimentary
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
Hardness: 6-7 (quartz components); Color: Tan, beige, grey; Luster: Dull/Earthy (matrix), Vitreous (quartz vein); Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.6-2.7
- Hardness
- 6-7 (quartz components)
- Color
- Tan, beige, grey
- Luster
- Dull/Earthy (matrix), Vitreous (quartz vein)
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Physical properties
Hardness: 6-7 (quartz components); Color: Tan, beige, grey; Luster: Dull/Earthy (matrix), Vitreous (quartz vein); Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.6-2.7
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. The visible vein formed later when silica-rich hydrothermal fluids filled a fracture in the rock and crystallized as quartz.
Uses & applications
Common sandstone is used extensively in construction, building facades, and as an abrasive. Specimens with distinct veins are primarily for geological study or amateur collecting.
Geological facts
Sandstone can be found in almost every geological age and represents about 20% of all sedimentary rocks on Earth. The thin white line in this specimen is a classic example of a 'mineral vein'.
Field identification & locations
Identify in the field by its gritty 'sandpaper' feel and visible layers or mineral veins. Commonly found in riverbeds, canyons, and sedimentary basins worldwide.
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