Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

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

Banded Calcite (often marketed as 'Mexican Onyx') (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often marketed as 'Mexican Onyx')

Calcite (Calcium Carbonate, CaCO3)

Brown Jasper (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Brown Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Jasper (likely Polychrome or Ocean Jasper) (Silicon Dioxide (SiO2) with impurities) — sedimentary

Jasper (likely Polychrome or Ocean Jasper)

Silicon Dioxide (SiO2) with impurities

Sandstone (Arenite (clastic sedimentary rock)) — sedimentary

Sandstone

Arenite (clastic sedimentary rock)

Granite Cobble/Pebble (Granite) — Igneous

Granite Cobble/Pebble

Granite

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

River Pebble (Gabbro or Basalt) (Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)) — igneous

River Pebble (Gabbro or Basalt)

Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)

Scoria (Vesicular Basalt) (Vesicular Basalt) — igneous

Scoria (Vesicular Basalt)

Vesicular Basalt

Basalt with Epidote (Greenstone) (Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)) — igneous

Basalt with Epidote (Greenstone)

Amygdaloidal Basalt (Ca2(Al, Fe)3(SiO4)3(OH) inclusions)

Sandstone (with Iron Staining) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (with Iron Staining)

Clastic Sedimentary Rock (primarily SiO2)

Fairburn Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Fairburn Agate

Cryptocrystalline Quartz (SiO2)

Montana Moss Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Montana Moss Agate

Chalcedony (Silicon Dioxide, SiO2)

Granite Cobble (Plutonic Granite) — igneous

Granite Cobble

Plutonic Granite

Diorite (Salt and Pepper Rock) (Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)) — igneous

Diorite (Salt and Pepper Rock)

Diorite (comprising Plagioclase Feldspar, Hornblende, and Biotite)

Vesicular Basalt (River Rock) (Afanitic Vesicular Basalt) — igneous

Vesicular Basalt (River Rock)

Afanitic Vesicular Basalt

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Basalt (Basalt) — igneous

Basalt

Basalt

Granite Pegmatite (Coarse-grained Granite (SiO2 - Aluminum and Alkalies)) — igneous

Granite Pegmatite

Coarse-grained Granite (SiO2 - Aluminum and Alkalies)

Quartz-veined Siltstone (Siltstone with Quartz (SiO2) veins) — sedimentary

Quartz-veined Siltstone

Siltstone with Quartz (SiO2) veins

Conglomerate (Clastic Sedimentary Rock (Conglomerate)) — sedimentary

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Conglomerate (Clastic sedimentary rock (Conglomerate)) — sedimentary

Conglomerate

Clastic sedimentary rock (Conglomerate)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate (Conglomerate (clastic sedimentary rock)) — sedimentary

Conglomerate

Conglomerate (clastic sedimentary rock)

Conglomerate (Conglomerate (Detrital Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Detrital Sedimentary Rock)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Limestone with Iron Inclusions (Calcium Carbonate (CaCO3) with Hematite/Limonite) — sedimentary

Limestone with Iron Inclusions

Calcium Carbonate (CaCO3) with Hematite/Limonite

Chert (Flint) (Chert (predominantly SiO₂ - silicon dioxide)) — sedimentary

Chert (Flint)

Chert (predominantly SiO₂ - silicon dioxide)

Sandstone (Quartzose Pebble) (Clastic Sedimentary Rock (Litharenite/Quartz arenite)) — sedimentary

Sandstone (Quartzose Pebble)

Clastic Sedimentary Rock (Litharenite/Quartz arenite)

Quartzite River Stone (Metamorphosed Quartz-rich Sandstone (SiO2)) — metamorphic

Quartzite River Stone

Metamorphosed Quartz-rich Sandstone (SiO2)

Geode (unopened) (Chert / Chalcedony Geode (SiO2)) — sedimentary

Geode (unopened)

Chert / Chalcedony Geode (SiO2)

Limonite Concretion (Ironstone) (Limonite (FeO(OH)·nH2O) / Goethite) — sedimentary

Limonite Concretion (Ironstone)

Limonite (FeO(OH)·nH2O) / Goethite

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron oxide inclusions

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Banded Calcite (often marketed as Mexican Onyx or Onyx Marble) (Calcite (Calcium Carbonate, CaCO3)) — sedimentary

Banded Calcite (often marketed as Mexican Onyx or Onyx Marble)

Calcite (Calcium Carbonate, CaCO3)

Quartz (Druzy) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky or Cloudy variety) (Quartz (Silicon Dioxide, SiO2)) — mineral

Quartz (Milky or Cloudy variety)

Quartz (Silicon Dioxide, SiO2)

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

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Dalmatian Jasper (Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)) — igneous

Dalmatian Jasper

Dalmatian Stone (comprised of Feldspar, Quartz, and Arfvedsonite)

Dalmatian Jasper (Peralkaline Quartz Feldspar Porphyry) — igneous

Dalmatian Jasper

Peralkaline Quartz Feldspar Porphyry

Dalmatian Stone (Dalmatian Jasper (Aplitic Rock)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)