sedimentary

Sandstone (Quartz-rich)

Arenite (composed primarily of SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale); Color: Brown, tan, and grey-speckled; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: approx 2.0-2.6

Hardness: 6-7 (Mohs scale)
Color: Brown, tan, and grey-speckled
Luster: Dull/Earthy

Identified June 20, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale); Color: Brown, tan, and grey-speckled; Luster: Dull/Earthy; Crystal structure: Clastic (sand grains); Cleavage: None; Specific gravity: approx 2.0-2.6

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen shows signs of being water-worn on a beach or riverbed, likely dating from various geologic eras depending on the local strata.

Uses & applications

Used widely as a building material, road base, and for manufacturing glass when quartz content is high. Also common in landscaping and as a sharpening stone.

Geological facts

Sandstone makes up about 20% to 25% of all sedimentary rocks on Earth. It often preserves fossils and ripple marks from ancient riverbeds or deserts.

Field identification & locations

Identify by its 'sandpaper' feel and visible grains. Common in coastal areas, deserts, and sedimentary basins worldwide. Collectors look for unique banding or fossil inclusions.