sedimentary
Sandstone Beach Pebble
Clastic Sedimentary Rock (primarily Quartz with Iron Oxide coating)
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 More sedimentary →
Identify your own rocks.
Get a report just like this from any photo, free.
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).
More like this
Other sedimentary specimens
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Shale or Slaty Mudstone
Argillaceous sedimentary rock
sedimentary
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Sandstone (Quartz-rich)
Arenite (SiO2)
sedimentary
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary