sedimentary

Sandstone with Quartz Vein

Arenite with SiO2 intrusion

AI-generated identification · may be incorrect

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)

Identified April 24, 2026More sedimentary →

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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.