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

Quartz (Milky/Yellowish)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Red Jasper (River Smooth) (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper (River Smooth)

Silicon Dioxide (SiO2) with Hematite impurities

River Pebbles / Mudstone (Sedimentary Rock / Silty Claystone) — sedimentary

River Pebbles / Mudstone

Sedimentary Rock / Silty Claystone

River Pebble (likely Quartzite or Chert) (Silicon Dioxide (SiO2)) — metamorphic or sedimentary

River Pebble (likely Quartzite or Chert)

Silicon Dioxide (SiO2)

metamorphic or sedimentary

Basalt pebble (Fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine) — igneous

Basalt pebble

Fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene with possible olivine

Rounded dark river pebble (Likely basalt or fine-grained andesite; exact identification requires testing) — igneous

Rounded dark river pebble

Likely basalt or fine-grained andesite; exact identification requires testing

Polished banded gneiss pebble (Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image) — metamorphic

Polished banded gneiss pebble

Gneiss, chiefly quartz–feldspar–mica; exact mineralogy uncertain from image

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)

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

Chert/Jasper

Microcrystalline Quartz (SiO2)

Granite Pebble (Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)) — igneous

Granite Pebble

Granite (composed primarily of Quartz SiO2, Feldspar KAlSi3O8, and Biotite/Hornblende)

Porphyry (Porphyritic Basalt or Andesite) — igneous

Porphyry

Porphyritic Basalt or Andesite

Basalt (Greenstone) (Basalt with chlorite/epidote (often referred to as Greenstone)) — igneous

Basalt (Greenstone)

Basalt with chlorite/epidote (often referred to as Greenstone)

Yellow Quartz Pebble (SiO2 (Silicon Dioxide) with Iron Impurities) — mineral

Yellow Quartz Pebble

SiO2 (Silicon Dioxide) with Iron Impurities

White quartz pebble (Quartz (silicon dioxide, SiO₂), likely milky quartz) — mineral

White quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

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

Chert (Quartzite Pebble)

Microcrystalline Quartz (SiO2)

Agate (Chert/Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Rounded gray pebble, likely limestone or fine-grained basalt (Indeterminate from image; possible micritic limestone (calcite, CaCO₃) or basalt (plagioclase, pyroxene, minor oxides)) — sedimentary or igneous

Rounded gray pebble, likely limestone or fine-grained basalt

Indeterminate from image; possible micritic limestone (calcite, CaCO₃) or basalt (plagioclase, pyroxene, minor oxides)

sedimentary or igneous

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Granite Pebble (Granite) — igneous

Granite Pebble

Granite

Pink Granite (Phaneritic Coarse-Grained Granite) — igneous

Pink Granite

Phaneritic Coarse-Grained Granite

Andesite River Stones (Andesite) — igneous

Andesite River Stones

Andesite

Granite Pebble (Intrusive Magmatic Granite (Quartz, Feldspar, Mica)) — igneous

Granite Pebble

Intrusive Magmatic Granite (Quartz, Feldspar, Mica)

Stream-Rounded Shale or Mudstone (Argillaceous sedimentary rock) — sedimentary

Stream-Rounded Shale or Mudstone

Argillaceous sedimentary rock

River Pebble (Siltstone/Mudstone) (Clastic sedimentary rock) — sedimentary

River Pebble (Siltstone/Mudstone)

Clastic sedimentary rock

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 Pebble (Gneiss (Metamorphic Foliated Rock)) — metamorphic

Gneiss Pebble

Gneiss (Metamorphic Foliated Rock)

Granite Water-worn Cobble (Felsic intrusive igneous rock (Phaneritic)) — igneous

Granite Water-worn Cobble

Felsic intrusive igneous rock (Phaneritic)

Gray Pebble (Graywacke / Basalt) (Graywacke (or fine-grained Basalt)) — sedimentary

Gray Pebble (Graywacke / Basalt)

Graywacke (or fine-grained Basalt)

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

Granite Pebble

Intrusive Igneous Rock (Granite)

Ocean Jasper (Orbicular Jasper (Silicon Dioxide, SiO2)) — sedimentary

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

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

Granite

Granite (Felsic Intrusive Igneous Rock)

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

Granite Pebble

Granite (Phaneritic intrusive igneous rock)

Pink Granite (Phaneritic Felsic Intrusive Igneous Rock) — igneous

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Agate (Water-Worn) (Cryptocrystalline quartz (SiO2)) — sedimentary

Agate (Water-Worn)

Cryptocrystalline quartz (SiO2)

Red Jasper (Silicon Dioxide with Iron Oxide (SiO2)) — mineral

Red Jasper

Silicon Dioxide with Iron Oxide (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)

Carnelian Agate (Chalcedony (SiO2)) — mineral

Carnelian Agate

Chalcedony (SiO2)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)