sedimentary

Sandstone (Pebble)

Sandstone (SiO2 dominated clastic sedimentary rock)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs scale), Color: light greenish-grey to tan, Luster: dull to earthy, Texture: fine-grained clastic sand-sized grains cemented together, Specific Gravity: 2.2-2.8

Identified July 24, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs scale), Color: light greenish-grey to tan, Luster: dull to earthy, Texture: fine-grained clastic sand-sized grains cemented together, Specific Gravity: 2.2-2.8

Formation & geological history

Formed by the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in riverbeds, beaches, or desert environments. Over time, weathering and water action rounded this piece into a small pebble.

Uses & applications

Commonly used in construction, landscaping, road base, and as decorative gravel. Small pebbles are popular for terrariums and aquariums.

Geological facts

Sandstone accounts for roughly 20% of all sedimentary rocks on Earth. Its color varies widely based on impurities, with iron oxides creating red hues and chlorite or clay minerals giving greenish tints.

Field identification & locations

Identified in the field by its distinctive grainy sand-like texture felt with fingertips or seen under magnification. Abundant worldwide along riverbanks, lakeshores, beaches, and eroded sedimentary rock formations.