sedimentary
Sandstone Pebble
Arenite (Sandstone)
Hardness: 6-7 (Mohs scale), Color: tan, beige, and cream with dark brown banding, Luster: dull/earthy, Texture: clastic (sand-sized grains), Structure: visible cross-bedding or laminations
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, beige, and cream with dark brown banding, Luster: dull/earthy, Texture: clastic (sand-sized grains), Structure: visible cross-bedding or laminations
Formation & geological history
Formed by the accumulation and cementation of mineral particles or rock fragments of sand size, often in riverbeds, deserts, or marine environments. The banding suggests rhythmic deposition or mineral staining (Liesegang rings).
Uses & applications
Primarily used in construction and glassmaking on a large scale; small pebbles are used for landscaping, aquarium gravel, or as decorative pocket stones.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth. The rhythmic lines in this specimen are likely a result of changing water energy or the precipitation of iron oxides within the porous rock.
Field identification & locations
Identify by its 'sandpaper' feel and visible layers. Commonly found in riverbeds, sedimentary basins, and coastal areas worldwide.
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
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