sedimentary

Sandstone Beach Pebble

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, yellowish-brown to orange (iron-stained); Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 (Mohs)
Color: Tan, yellowish-brown to orange (iron-stained)
Luster: Dull/Earthy

Identified March 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, yellowish-brown to orange (iron-stained); Luster: Dull/Earthy; Crystal Structure: Granular/Clastic; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen shows significant rounding and smoothing from high-energy water transport (beach or river action). Geological age varies by region but is likely Paleozoic to Cenozoic.

Uses & applications

Common industrial uses for sandstone include construction aggregate, glass manufacturing (if high silica), and as a building stone. Smooth pebbles like this are often used in landscaping, home decor, or as 'worry stones'.

Geological facts

Sandstone acts as a natural filter for groundwater and is one of the most common types of sedimentary rock on Earth. The orange/yellow hue is specifically caused by the oxidation of iron-bearing minerals, commonly referred to as 'limonite stain'.

Field identification & locations

Identify by its gritty, sand-like texture when scratched and visible layers or banding. Often found on coastlines, riverbeds, and desert regions. Collectors often look for unique shapes or 'omars' (stones with circular pits).