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 with iron inclusion (Silicon Dioxide (SiO2)) — mineral

Quartz pebble with iron inclusion

Silicon Dioxide (SiO2)

Chalcedony (Agate Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chalcedony (Agate Pebble)

Microcrystalline Quartz (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Jasper and Basalt Mix (Dark Chert/Basalt River Pebble) (Silicon Dioxide (SiO2) or Mafic extrusive igneous rock) — sedimentary or igneous

Jasper and Basalt Mix (Dark Chert/Basalt River Pebble)

Silicon Dioxide (SiO2) or Mafic extrusive igneous rock

sedimentary or igneous

Quartzite Pebble (or River Agate/Chert) (Silicon Dioxide (SiO2)) — metamorphic

Quartzite Pebble (or River Agate/Chert)

Silicon Dioxide (SiO2)

Chalcedony (Agate) (Chalcedony (Cryptocrystalline Quartz, SiO2)) — mineral

Chalcedony (Agate)

Chalcedony (Cryptocrystalline Quartz, SiO2)

Chalcedony (Moonstone-like Agate) (Silicon Dioxide (SiO₂)) — mineral

Chalcedony (Moonstone-like Agate)

Silicon Dioxide (SiO₂)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Water-worn basalt pebble (Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine) — igneous

Water-worn basalt pebble

Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine

Tumbled milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Granite (likely biotite granite) (Coarse-grained felsic plutonic rock: quartz + feldspar + biotite; approximate composition SiO₂-rich) — igneous

Granite (likely biotite granite)

Coarse-grained felsic plutonic rock: quartz + feldspar + biotite; approximate composition SiO₂-rich

Quartz Grain / Sandstone Fragment (Silicon Dioxide (SiO2)) — sedimentary

Quartz Grain / Sandstone Fragment

Silicon Dioxide (SiO2)

Brown Jasper (Water-worn pebble) (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Brown Jasper (Water-worn pebble)

Silicon Dioxide (SiO2) with iron oxide impurities

Red Jasper (possibly Orbicular Jasper) (Silicon Dioxide with inclusions (SiO2)) — sedimentary

Red Jasper (possibly Orbicular Jasper)

Silicon Dioxide with inclusions (SiO2)

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

Chalcedony / Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky/Rose Quartz Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Rose Quartz Pebble)

Silicon Dioxide (SiO2)

Rounded porphyritic volcanic rock, likely andesite or rhyolite (Fine-grained silicate rock; likely plagioclase- and quartz/feldspar-bearing andesite–rhyolite) — igneous

Rounded porphyritic volcanic rock, likely andesite or rhyolite

Fine-grained silicate rock; likely plagioclase- and quartz/feldspar-bearing andesite–rhyolite

Gneiss (specifically Granitic Gneiss) (Gneiss) — metamorphic

Gneiss (specifically Granitic Gneiss)

Gneiss

River Stone (Chalcedony/Jasper variety) (Microcrystalline Quartz (SiO2)) — sedimentary

River Stone (Chalcedony/Jasper variety)

Microcrystalline Quartz (SiO2)

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (SiO2)

Banded Slate (Metamorphic Argillite / Slate) — metamorphic

Banded Slate

Metamorphic Argillite / Slate

Beach Pebble (Basalt / Greywacke Gravel) (Mafic Volcanic Rock (Basalt)) — igneous

Beach Pebble (Basalt / Greywacke Gravel)

Mafic Volcanic Rock (Basalt)

Polished river pebble (Indeterminate fine-grained fluvial clast, likely sandstone or chert) — sedimentary

Polished river pebble

Indeterminate fine-grained fluvial clast, likely sandstone or chert

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Greenstone / Chert (Cryptocrystalline Quartz (SiO2) or Altered Basalt) — sedimentary or metamorphic

Greenstone / Chert

Cryptocrystalline Quartz (SiO2) or Altered Basalt

sedimentary or metamorphic

Quartz (Milky/Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Iron-stained)

Silicon Dioxide (SiO2)

Basalt Pebble (Basaltic Igneous Rock) — igneous

Basalt Pebble

Basaltic Igneous Rock

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Crystalline Silica (SiO2)) — sedimentary

Quartz Pebble

Crystalline Silica (SiO2)

Tumbled quartz-rich pebble (Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony) — mineral

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Weathered Sandstone or Siltstone (Sedimentary Rock) — sedimentary

Weathered Sandstone or Siltstone

Sedimentary Rock

Banded Gneiss (Banded Gneiss (High-grade Metamorphic Rock)) — metamorphic

Banded Gneiss

Banded Gneiss (High-grade Metamorphic Rock)

Carnelian (Carnelian (Silicon Dioxide, SiO2)) — mineral

Carnelian

Carnelian (Silicon Dioxide, SiO2)

River Cobble (likely Basalt or Chert) (Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous) — igneous/sedimentary

River Cobble (likely Basalt or Chert)

Siliceous River Rock / Microcrystalline Quartz / Mafic Igneous

igneous/sedimentary

Magnetite (Lodestone variety) (Magnetite (Iron(II,III) oxide, Fe3O4)) — mineral

Magnetite (Lodestone variety)

Magnetite (Iron(II,III) oxide, Fe3O4)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Black Sand (Magnetite Sand) (Magnetite-rich Placers (Fe3O4)) — sedimentary

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

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

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

River Rock (Silica-rich water-worn rock / Quartzite) — sedimentary

River Rock

Silica-rich water-worn rock / Quartzite