sedimentary

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Hardness: 6-7 (Mohs scale); Color: Tan, beige, brown with visible banding; Luster: Dull/Earthy; Crystal structure: Clastic (sand-sized grains); Cleavage: None, breaks across grains; Specific gravity: 2.2-2.8

Hardness: 6-7 (Mohs scale)
Color: Tan, beige, brown with visible banding
Luster: Dull/Earthy

Identified May 6, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed by the accumulation and lithification of mineral particles or rock fragments. The visible layers represent different depositional events or changes in mineral concentrate over millions of years, often in riverbeds, deserts, or coastal environments.

Uses & applications

Used primarily as a building material, decorative stone, or for making grindstones. In smaller specimens, it is collected for its aesthetic 'picture stone' qualities.

Geological facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The famous Red Rocks of Colorado and the structures of Petra are carved into sandstone formations.

Field identification & locations

Identify by its gritty, sandpaper-like feel and visible layering (stratification). It can be found globally in outcrops, riverbeds, and cliffs. Collectors look for unique patterns like 'Wonderstone' or Liesegang rings.

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Sandstone or Siltstone

Arenite (if sandstone)

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Cone-in-cone structure (Limestone)

Cone-in-cone structure (Secondary Sedimentary Structure)

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Chert Breccia

Brecciated Chert (Microcrystalline Silica)

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Sandstone Grain

Clastic Sedimentary Rock Grain (SiO2 dominated)

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Shale or Slaty Mudstone

Argillaceous sedimentary rock

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Sandstone

Arenite (primarily SiO2)

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