sedimentary

Sandstone (Pebble)

Sandstone (principally SiO2 with iron oxide impurities)

AI-generated identification · may be incorrect

Hardness: 6-7 on Mohs scale; Color: Reddish-brown, tan, pink with darker iron/mineral inclusions; Luster: Dull to earthy, grainy surface texture; Structure: Clastic sedimentary composed of sand-sized quartz grains.

Hardness: 6-7 on Mohs scale
Color: Reddish-brown, tan, pink with darker iron/mineral inclusions
Luster: Dull to earthy, grainy surface texture

Identified July 23, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation, compaction, and cementation of sand grains deposited in ancient rivers, lakes, or desert environments. Over time, silica, calcite, or iron oxides act as cement to bind the grains together.

Uses & applications

Used widely as construction material, flagstone, decorative landscaping stones, and tumbling/carving specimens for amateur rock collectors.

Geological facts

Sandstone often preserves ripple marks, cross-bedding, and ancient environmental clues. Red and pink sandstones get their characteristic color from hematite (iron oxide) staining the quartz grains.

Field identification & locations

Identified by its distinctive gritty feel, sand-like texture under magnification, and rounded beach/river-worn pebble shape. Commonly found along river beds, beaches, and eroded sedimentary rock formations worldwide.