sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 Mohs; Color: Tan, grey, creamy white; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, grey, creamy white
Luster: Dull/Earthy

Identified July 18, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, grey, creamy white; Luster: Dull/Earthy; Texture: Granular, sandpaper-like feel; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river, lake, or ocean environments. This specimen shows signs of fluvial or lacustrine smoothing.

Uses & applications

Used widely in construction as a building stone, in the manufacture of glass (if pure silica), and as a common decorative landscaping stone.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The grains are often held together by silica, calcium carbonate, or iron oxide, which acts as a natural cement.

Field identification & locations

Identify in the field by its gritty texture and visible sand grains. It is commonly found in sedimentary basins and along riverbeds. It will not react to acid unless the cementing agent is calcite.