Rock Identifier
Banded Sandstone or Quartzite Pebble (SiO2 (dominant) with impurities) — sedimentary or metamorphic
sedimentary or metamorphic

Banded Sandstone or Quartzite Pebble

SiO2 (dominant) with impurities

AI-generated identification · may be incorrect

Hardness: 6-7 (Mohs); Color: Tan, brown, grey bands; Luster: Dull to waxy when wet; Crystal structure: Microcrystalline or granular quartz; Cleavage: None; Specific gravity: ~2.6-2.7

Hardness
6-7 (Mohs)
Color
Tan, brown, grey bands
Luster
Dull to waxy when wet
Identified More sedimentary or metamorphic →
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Physical properties

Hardness: 6-7 (Mohs); Color: Tan, brown, grey bands; Luster: Dull to waxy when wet; Crystal structure: Microcrystalline or granular quartz; Cleavage: None; Specific gravity: ~2.6-2.7

Formation & geological history

Formed originally as sedimentary layers of sand, subsequently lithified (sandstone) and potentially metamorphosed into quartzite, then rounded by water action in a river or beach environment.

Uses & applications

Decorative gravel, landscaping, casual collecting

Geological facts

The distinct banding represents different depositional events or mineral impurities (like iron oxides) during the original sediment accumulation.

Field identification & locations

Can be identified by its distinct sedimentary layers and rounded shape resulting from fluvial or coastal tumbling. Common on beaches and riverbeds.

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Other sedimentary or metamorphic specimens

Natural freshwater pearls (Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)) — gemstone

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

gemstone
Dark gray rounded river pebble (Likely basalt or fine-grained volcanic rock; exact identification requires testing) — igneous

Dark gray rounded river pebble

Likely basalt or fine-grained volcanic rock; exact identification requires testing

igneous
Weathered dark stone, possibly basalt (Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine) — igneous

Weathered dark stone, possibly basalt

Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine

igneous
Painted River Rock (Artificially Coated Sedimentary Rock) — sedimentary

Painted River Rock

Artificially Coated Sedimentary Rock

sedimentary
Rounded gray river cobble (Likely fine-grained sandstone, siltstone, or metamorphosed equivalent; exact identification requires a fresh surface and tests) — sedimentary

Rounded gray river cobble

Likely fine-grained sandstone, siltstone, or metamorphosed equivalent; exact identification requires a fresh surface and tests

sedimentary
Mixed collection of common river stones (Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material) — igneous, sedimentary, metamorphic

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

igneous, sedimentary, metamorphic