sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, cream, or light grey with slight iron-oxide banding; Luster: Dull/Earthy; Texture: Granular/Sand-like; Cleavage: None; Structure: Massive or bedded.

Hardness: 6-7 Mohs
Color: Tan, cream, or light grey with slight iron-oxide banding
Luster: Dull/Earthy

Identified July 9, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, cream, or light grey with slight iron-oxide banding; Luster: Dull/Earthy; Texture: Granular/Sand-like; Cleavage: None; Structure: Massive or bedded.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. This specimen shows signs of river or beach tumbling, giving it a rounded, water-worn shape. Typically Phanerozoic in age.

Uses & applications

Used widely as a building material, paving, and in the manufacturing of glass and grindstones. In domestic gardening, it is popular for landscaping.

Geological facts

Sandstone accounts for about 20% of all sedimentary rocks on Earth. The distinct bands visible on the surface are often caused by the migration of groundwater containing dissolved iron.

Field identification & locations

Identify in the field by its gritty 'sandpaper' feel. It is commonly found in desert basins, river beds, and coastal areas. Collectors look for unique banding patterns known as Liesegang rings.