sedimentary

Sandstone (Quartz-rich)

Arenite (composed mainly of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (individual sand grains); Color: Tan, brown, or ochre; Luster: Dull or earthy; Texture: Gritty/sandpaper feel; Specific Gravity: 2.2-2.8.

Hardness: 6-7 (individual sand grains)
Color: Tan, brown, or ochre
Luster: Dull or earthy

Identified April 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (individual sand grains); Color: Tan, brown, or ochre; Luster: Dull or earthy; Texture: Gritty/sandpaper feel; Specific Gravity: 2.2-2.8.

Formation & geological history

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in riverbeds, deserts, or marine environments. Age ranges from Precambrian to Holocene.

Uses & applications

Commonly used as a building material, in the manufacturing of glass (if high quartz purity), and as a reservoir rock for oil and natural gas.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The Famous 'Antelope Canyon' in Arizona is carved entirely out of sandstone.

Field identification & locations

Identify by its gritty texture (feels like sandpaper when rubbed) and visible sand grains. Found globally in sedimentary basins. Collectors should look for unique cross-bedding or ripple marks.