sedimentary

Sandstone (Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

AI-generated identification · may be incorrect

Hardness: 6-7 Mohs; Color: Tan to light brown; Luster: Dull/Earthy; Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8. Shows a smooth, water-worn texture.

Hardness: 6-7 Mohs
Color: Tan to light brown
Luster: Dull/Earthy

Identified July 10, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan to light brown; Luster: Dull/Earthy; Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8. Shows a smooth, water-worn texture.

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. This specific rounded shape indicates water erosion in a river, stream, or beach environment over many years.

Uses & applications

Used in construction, landscaping, road base, and as a common decorative garden stone. Pure quartz sandstones are used in glass manufacturing.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The smooth 'river rock' texture seen here is a result of abrasion against other rocks in moving water.

Field identification & locations

Identify in the field by its gritty texture (feels like sandpaper if broken) and visible layering (bedding). Found worldwide in basins and coastal regions. Collectors often value heart-shaped or exceptionally smooth specimens like this one.