Rock Identifier

Category

Igneous Or Sedimentary (Water Worn)

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

Pegmatite (Granitic Pegmatite) — igneous

Pegmatite

Granitic Pegmatite

igneous
Sandstone (Weathered Cobble) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (Weathered Cobble)

Clastic Sedimentary Rock (primarily SiO2)

sedimentary
Basalt (River or Beach Pebble) (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt (River or Beach Pebble)

Basalt (Mafic Extrusive Igneous Rock)

igneous
Basalt (River Stone) (Basalt (Aphanitic Mafic Igneous Rock)) — igneous

Basalt (River Stone)

Basalt (Aphanitic Mafic Igneous Rock)

igneous
Jasper (Red Chert) (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper (Red Chert)

Jasper (Silicon Dioxide, SiO2)

sedimentary
Brecciated Limestone or Marble Pebble (Breccia / Calcite (CaCO3)) — Sedimentary / Metamorphic

Brecciated Limestone or Marble Pebble

Breccia / Calcite (CaCO3)

Sedimentary / Metamorphic
Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary
Yellow Quartz (Iron-Stained Quartz) (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Yellow Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with iron oxide inclusions

mineral
Glauconitic Sandstone (Greensand (Glauconite-bearing sandstone)) — sedimentary

Glauconitic Sandstone

Greensand (Glauconite-bearing sandstone)

sedimentary
Granite Cobble (River Stone) (Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)) — igneous

Granite Cobble (River Stone)

Felsic intrusive igneous rock (composition: Quartz, Feldspar, Mica)

igneous
Sandstone (Arenite (SiO2 based typically)) — sedimentary

Sandstone

Arenite (SiO2 based typically)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Selenite (Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O) — mineral

Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

mineral
Herkimer Diamond (Quartz (Silica - SiO2)) — mineral

Herkimer Diamond

Quartz (Silica - SiO2)

mineral
Conglomerate (Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Conglomerate

Conglomerate (Clastic Sedimentary Rock)

sedimentary
Sandstone (Quartzose) (Sandstone (clastic sedimentary rock, primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Sandstone (clastic sedimentary rock, primarily SiO2)

sedimentary
Sandstone (with potential iron-oxide weathering) (Arenite (SiO2 based)) — sedimentary

Sandstone (with potential iron-oxide weathering)

Arenite (SiO2 based)

sedimentary
Granite Cobble (Granite) — igneous

Granite Cobble

Granite

igneous
Basalt (Beach Pebble) (Extrusive mafic volcanic rock) — igneous

Basalt (Beach Pebble)

Extrusive mafic volcanic rock

igneous
Diabase (Greenstone Pebble) (Diabase or Dolerite) — igneous

Diabase (Greenstone Pebble)

Diabase or Dolerite

igneous
Quartz (Milky/Common) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

mineral
Yellow Calcite (Calcite (Calcium Carbonate, CaCO3)) — mineral

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

mineral
Hematite (Hematite, Iron(III) oxide (Fe2O3)) — mineral

Hematite

Hematite, Iron(III) oxide (Fe2O3)

mineral
Agate (Banded Chalcedony (SiO2)) — mineral

Agate

Banded Chalcedony (SiO2)

mineral
Chert (Iron-stained) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

sedimentary
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

sedimentary
Dalmatian Stone (Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)) — igneous

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

igneous
Travertine (Calcareous Tufa / Travertine (CaCO3)) — sedimentary

Travertine

Calcareous Tufa / Travertine (CaCO3)

sedimentary
Scoria (Lava Rock) (Scoria (Mafic Volcanic Rock)) — igneous

Scoria (Lava Rock)

Scoria (Mafic Volcanic Rock)

igneous
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Sandstone (Greywacke) (Sandstone (SiO2 enriched with lithic fragments)) — sedimentary

Sandstone (Greywacke)

Sandstone (SiO2 enriched with lithic fragments)

sedimentary
Sandstone (specifically Arkose or Quartz Arenite) (Arenite (primarily SiO2 with possible Feldspar)) — sedimentary

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

sedimentary
Yellow Quartz (Citrine Quartz or Yellow Jasper) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Yellow Quartz (Citrine Quartz or Yellow Jasper)

Silicon Dioxide (SiO2) with iron impurities

mineral
Red Scoria (Scoria (Vesicular Basalt/Andesite)) — igneous

Red Scoria

Scoria (Vesicular Basalt/Andesite)

igneous
Milky Quartz (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

sedimentary
Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

sedimentary
Limestone (CaCO3 (Mainly Calcite or Aragonite)) — sedimentary

Limestone

CaCO3 (Mainly Calcite or Aragonite)

sedimentary
Tiger's Eye (Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2) — Mineral

Tiger's Eye

Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2

Mineral
Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

metamorphic