Rock Identifier
Painted River Rock (Polished fluvial clast with acrylic/synthetic pigment coating) — Sedimentary or Metamorphic (base substrate)
Sedimentary or Metamorphic (base substrate)

Painted River Rock

Polished fluvial clast with acrylic/synthetic pigment coating

AI-generated identification · may be incorrect

Hardness: 6.5-7 (if quartzite/basalt substrate); Color: Natural dark grey/black base covered with gold, green, and black paint; Luster: Glossy (due to paint/sealant); Structure: Massive, water-worn rounded shape.

Hardness
6
Luster
Glossy (due to paint/sealant)
Identified More sedimentary or metamorphic (base substrate) →
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Physical properties

Hardness: 6.5-7 (if quartzite/basalt substrate); Color: Natural dark grey/black base covered with gold, green, and black paint; Luster: Glossy (due to paint/sealant); Structure: Massive, water-worn rounded shape.

Formation & geological history

The base is a stone typically formed through sedimentary deposition or volcanic activity, subsequently rounded by river or glacial erosion. The surface art is a modern human modification using synthetic paints.

Uses & applications

Decorative art piece, paperweight, garden ornament, or 'kindness rock' for community sharing.

Geological facts

Painted rocks are part of a global movement where people hide art in public spaces for others to find. The substrate is likely a river cobble, which can take thousands of years to naturally round through attrition.

Field identification & locations

Identify by the presence of non-geological pigments and brushstrokes on a naturally rounded stone. Common in craft stores and parks.

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Other sedimentary or metamorphic (base substrate) specimens

Painted Rock (Rock coated with synthetic acrylic paint) — sedimentary

Painted Rock

Rock coated with synthetic acrylic paint

sedimentary
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Barnacle encrusted stone

Biogenic calcareous concretion

sedimentary
River Stone (Quartzite/Siltstone mixture) (Silicon Dioxide (SiO2) based metamorphosed sandstone) — metamorphic or sedimentary

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

metamorphic or sedimentary
Soil Clod / Caliche Nodules (Pedogenic Calcrete / Clay aggregate) — sedimentary

Soil Clod / Caliche Nodules

Pedogenic Calcrete / Clay aggregate

sedimentary
Likely dyed or painted stone (Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.) — metamorphic

Likely dyed or painted stone

Unidentified natural rock; vivid purple, orange, and pink coloration appears to be a surface coating or pigment, so the underlying rock cannot be reliably identified from the image.

metamorphic
River Rocks (Polished River Pebbles) (Stream-rounded clastic sediments) — Mixed (Sedimentary, Igneous, and Metamorphic)

River Rocks (Polished River Pebbles)

Stream-rounded clastic sediments

Mixed (Sedimentary, Igneous, and Metamorphic)