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

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone Pebble (Arenite (SiO2 with various cementing agents)) — sedimentary

Sandstone Pebble

Arenite (SiO2 with various cementing agents)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Chert (Quartzite Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Quartzite Pebble)

Microcrystalline Quartz (SiO2)

Chert (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Quartz, SiO2)

Banded Rhyolite (Rhyolite (High-silica volcanic rock)) — igneous

Banded Rhyolite

Rhyolite (High-silica volcanic rock)

Quartz Pebble (Chalcedony/Chert) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Chalcedony/Chert)

Silicon Dioxide (SiO2)

Banded Agate / Shell Fossil Fragment (Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)) — sedimentary

Banded Agate / Shell Fossil Fragment

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)

Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Chalcedony Pebble

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon Dioxide (SiO2) with impurities

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Basalt (tumbled/water-worn) (Extrusive mafic igneous rock) — igneous

Basalt (tumbled/water-worn)

Extrusive mafic igneous rock

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone (Ferruginous) (Arenite (variable SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (variable SiO2 with Fe2O3 staining)

Basalt Cobble (Basalt) — igneous

Basalt Cobble

Basalt

Granodiorite (Water-worn Pebble) (Granodiorite) — igneous

Granodiorite (Water-worn Pebble)

Granodiorite

Sandstone (Ferruginous) (Sandstone (SiO2 with iron oxide impurities)) — sedimentary

Sandstone (Ferruginous)

Sandstone (SiO2 with iron oxide impurities)

Pegmatitic granite (likely feldspar–quartz–mica rock) (Granitic pegmatite; chiefly K-feldspar and quartz, with mica and iron-oxide staining) — igneous

Pegmatitic granite (likely feldspar–quartz–mica rock)

Granitic pegmatite; chiefly K-feldspar and quartz, with mica and iron-oxide staining

Basalt River Stone (Basalt) — igneous

Basalt River Stone

Basalt

Banded Jasper / Chert Beach Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Jasper / Chert Beach Pebble

Microcrystalline Quartz (SiO2)

River Pebbles (Mixed Lithology) (Conglomerate clasts (Silica-rich and Metamorphic assemblages)) — sedimentary

River Pebbles (Mixed Lithology)

Conglomerate clasts (Silica-rich and Metamorphic assemblages)

River Stone (Green Quartzite) (Quartzite (Metamorphosed Sandstone)) — metamorphic

River Stone (Green Quartzite)

Quartzite (Metamorphosed Sandstone)

Chert (Smooth River Pebble) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gneiss (Metamorphic Rock Pebble) (Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)) — metamorphic

Gneiss (Metamorphic Rock Pebble)

Foliated Metamorphic Rock (Quartz-Feldspar Gneiss / Granitic Gneiss)

Chert Pebble (Jasper/Flint variant) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Pebble (Jasper/Flint variant)

Microcrystalline Quartz (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Yellow Jasper/Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Basalt with Plagioclase or Quartz Inclusion (Melanocratic Basalt with Porphyritic Inclusion) — igneous

Basalt with Plagioclase or Quartz Inclusion

Melanocratic Basalt with Porphyritic Inclusion

Chert/Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert/Jasper

Microcrystalline Quartz (SiO2)

Rounded gray river pebble, likely basalt or andesite (Fine-grained mafic to intermediate volcanic rock; exact identification requires testing) — igneous

Rounded gray river pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; exact identification requires testing

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

Quartz (Milky/Yellowish)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Quartzite/Siltstone) (Clastic Sedimentary Rock / Quartzite) — sedimentary

River Pebble (Quartzite/Siltstone)

Clastic Sedimentary Rock / Quartzite

Quartz (Smoky Quartz variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Basalt Pebble (Basalt) — igneous

Basalt Pebble

Basalt

Granite Pebble (Granite (Felsic Plutonic Rock)) — igneous

Granite Pebble

Granite (Felsic Plutonic Rock)

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Vesicular Basalt (Aqueous Tumbled) (Scoriaceous Basalt) — igneous

Vesicular Basalt (Aqueous Tumbled)

Scoriaceous Basalt

Granite (Granite (Felsic Intrusive Igneous Rock)) — igneous

Granite

Granite (Felsic Intrusive Igneous Rock)

Basalt pebble (Aphanitic Mafic Volcanic Rock (Fe/Mg rich)) — igneous

Basalt pebble

Aphanitic Mafic Volcanic Rock (Fe/Mg rich)

Basalt Pebble (Basalt (Mafic Volcanic Rock)) — igneous

Basalt Pebble

Basalt (Mafic Volcanic Rock)

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

Granite Pebble

Granite (Phaneritic intrusive igneous rock)