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

Gneiss (specifically Granitic Gneiss) (Gneiss) — metamorphic

Gneiss (specifically Granitic Gneiss)

Gneiss

Yellow or Honey Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow or Honey Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Quartzite Pebble (or River Agate/Chert)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

River Pebble (Quartzite / Weathered Sedimentary Rock) — sedimentary

River Pebble

Quartzite / Weathered Sedimentary Rock

Orthoclase (Potassium) Feldspar in Quartz (KAlSi3O8 (Potassium Aluminum Silicate)) — igneous

Orthoclase (Potassium) Feldspar in Quartz

KAlSi3O8 (Potassium Aluminum Silicate)

Quartz Pebble (Crystalline Silica (SiO2)) — sedimentary

Quartz Pebble

Crystalline Silica (SiO2)

Weathered Sandstone or Siltstone (Sedimentary Rock) — sedimentary

Weathered Sandstone or Siltstone

Sedimentary Rock

Sandstone pebble (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone pebble

Clastic sedimentary rock (primarily SiO2)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — mineral

Quartz pebble

Silicon dioxide (SiO2)

Yellow Quartz (Citrine or Yellow Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine or Yellow Chalcedony)

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)

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

Milky Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz (Iron-Stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Polished quartz pebble with iron-oxide inclusions (Quartz, SiO₂; likely included or milky quartz) — mineral

Polished quartz pebble with iron-oxide inclusions

Quartz, SiO₂; likely included or milky quartz

Smoky Quartz (Tumbled/Water-worn Quartz) (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz (Tumbled/Water-worn 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

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

River Rock

Silica-rich water-worn rock / Quartzite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Quartz Pebble (Milky Quartz)

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

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

Rounded river pebble, likely basaltic or andesitic rock

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

Basalt Pebble (Basaltic Igneous Rock) — igneous

Basalt Pebble

Basaltic Igneous Rock

Chalcedony Pebble (Cryptocrystalline Quartz (SiO2)) — mineral

Chalcedony Pebble

Cryptocrystalline Quartz (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

Granitoid (Common Granite/Gneiss) (Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)) — igneous

Granitoid (Common Granite/Gneiss)

Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)

Pink Granite (with Quartz Vein) (Granite (plutonic felsic igneous rock)) — igneous

Pink Granite (with Quartz Vein)

Granite (plutonic felsic igneous 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)

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

Red Jasper (possibly Orbicular Jasper)

Silicon Dioxide with inclusions (SiO2)

Gneiss (Banded Gneiss) (Gneiss) — metamorphic

Gneiss (Banded Gneiss)

Gneiss

River Cobble (Quartzite / Porphyritic Igneous Rock) (Siliceous rock / Water-worn lithic fragment) — igneous

River Cobble (Quartzite / Porphyritic Igneous Rock)

Siliceous rock / Water-worn lithic fragment

Banded Gneiss (Metamorphic Gneiss (High-grade regional metamorphism specimen)) — metamorphic

Banded Gneiss

Metamorphic Gneiss (High-grade regional metamorphism specimen)

Gneiss (Metamorphic Pebble) (Gneissic Metamorphic Rock) — metamorphic

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

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

Chalcedony / Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss (Gneiss) — metamorphic

Banded Gneiss

Gneiss

Chert (Chalcedony) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony)

Cryptocrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)