Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

Browse igneous or sedimentary (water worn) specimens identified by the Rock Identifier community.

Learn about Igneous Or Sedimentary (Water Worn) in the encyclopedia

Water Opal

Enhydro Quartz

Carbonatite

Clear Beryl

Ice Opal

Hyalite Opal

Iolite

Conglomerate

Jelly Opal

Clear Obsidian

Coldwater Agate

Clear Tourmaline

Clear Tourmaline

Polished gneiss or migmatitic gneiss cobble (Banded quartz–feldspar–biotite gneiss; compositionally possibly migmatitic) — metamorphic

Polished gneiss or migmatitic gneiss cobble

Banded quartz–feldspar–biotite gneiss; compositionally possibly migmatitic

Carnelian (Red Chalcedony (SiO2)) — mineral

Carnelian

Red Chalcedony (SiO2)

Chalcedony (Agate Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Quartz (Milky/Common Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Shiva Lingam (Cryptocrystalline Quartz (Jasper/Agate)) — sedimentary

Shiva Lingam

Cryptocrystalline Quartz (Jasper/Agate)

River Stone (River Pebbles) (Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)) — sedimentary

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz (River Cobble) (Silicon Dioxide (SiO2)) — mineral

Quartz (River Cobble)

Silicon Dioxide (SiO2)

Granite Pebble (Granite (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Water-worn fine-grained volcanic pebble, likely basalt (Basalt (tentative identification; fine-grained mafic volcanic rock)) — igneous

Water-worn fine-grained volcanic pebble, likely basalt

Basalt (tentative identification; fine-grained mafic volcanic rock)

Mixed river stones and gravel (Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate) — igneous, sedimentary, metamorphic

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

igneous, sedimentary, metamorphic

Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Jasper and Basalt River Pebble (Silica-rich volcanic rock with iron oxide staining) — igneous

Jasper and Basalt River Pebble

Silica-rich volcanic rock with iron oxide staining

Basalt (Basalt) — igneous

Basalt

Basalt

Porphyritic Basalt (Basalt (with plagioclase or k-feldspar phenocrysts)) — igneous

Porphyritic Basalt

Basalt (with plagioclase or k-feldspar phenocrysts)

Basalt (Basalt (composition of plagioclase feldspar and pyroxene)) — Igneous

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)

Jasper (Microcrystalline Quartz (SiO2)) — mineral

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Chert (or Jasper) (Silicon dioxide (SiO2)) — sedimentary

Chert (or Jasper)

Silicon dioxide (SiO2)

Jasper or Agate with Chlorite Inclusions (Silicon Dioxide (SiO2) with Chlorite group minerals) — sedimentary

Jasper or Agate with Chlorite Inclusions

Silicon Dioxide (SiO2) with Chlorite group minerals

Granite (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite

Granite (Phaneritic intrusive igneous rock)

Yellow Quartz Pebble (Quartz (Silicon Dioxide, SiO2)) — mineral

Yellow Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Beach Pebble (likely Basalt or Chert) (Volcanic Basalt / Microcrystalline Quartz) — igneous

Beach Pebble (likely Basalt or Chert)

Volcanic Basalt / Microcrystalline Quartz

River Cobble (likely Basalt or Metagraywacke) (Non-specific water-worn lithic fragment) — igneous or metamorphic

River Cobble (likely Basalt or Metagraywacke)

Non-specific water-worn lithic fragment

igneous or metamorphic

Quartz Pebble (Sea Glass-like texture) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Sea Glass-like texture)

Silicon Dioxide (SiO2)

Chert (River Cobble) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (River Cobble)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Brecciated Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

River Pebble (Polished Quartzite or Mixed Lithology) — sedimentary

River Pebble

Polished Quartzite or Mixed Lithology

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Jasper (Green) (Silicon dioxide (SiO2)) — Mineral/Sedimentary

Jasper (Green)

Silicon dioxide (SiO2)

Mineral/Sedimentary

Chert (River Pebble) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Cryptocrystalline Quartz (SiO2)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Quartz (Water-worn pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Milky Quartz Pebble (Crystalline Quartz (SiO2)) — mineral

Milky Quartz Pebble

Crystalline Quartz (SiO2)