Rock Identifier

Category

Sedimentary Or Igneous (Host Environment)

Browse sedimentary or igneous (host environment) specimens identified by the Rock Identifier community.

Banded Iron Formation (BIF) / Tiger Iron variety (Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)) — sedimentary

Banded Iron Formation (BIF) / Tiger Iron variety

Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)

Quartz (specifically Milky or Clear Chunk) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Milky or Clear Chunk)

Silicon Dioxide (SiO2)

River Stone (Quartzite/Siltstone mixture) (Silicon Dioxide (SiO2) based metamorphosed sandstone) — metamorphic or sedimentary

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

metamorphic or sedimentary

Sandstone (likely Quartzose Sandstone) (Clastic Sedimentary Rock (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose Sandstone)

Clastic Sedimentary Rock (primarily SiO2)

Sandstone (Ferruginous) (Arenite with Iron-Oxide Cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Calcite (Optical or Clear Calcite) (Calcium Carbonate (CaCO3)) — mineral

Calcite (Optical or Clear Calcite)

Calcium Carbonate (CaCO3)

Quartz Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Fragment

Silicon Dioxide (SiO2)

Hematite (Hematite (Α-Fe2O3)) — mineral

Hematite

Hematite (Α-Fe2O3)

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Crystalline variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Quartz Mineral (Silicon Dioxide (SiO2)) — mineral

Quartz Mineral

Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite in Matrix (often with Chalcopyrite) (Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)) — mineral

Pyrite in Matrix (often with Chalcopyrite)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Potassium Feldspar and Quartz (KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)) — mineral

Potassium Feldspar and Quartz

KAlSi3O8 (Potassium Feldspar) and SiO2 (Quartz)

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

Chalcedony (Agate/Quartz)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon dioxide (SiO2)) — Mineral

Quartz

Silicon dioxide (SiO2)

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

Basalt River Stone

Basalt (Aphanitic Mafic Volcanic Rock)

Pink Granite (Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (Rich in K-Feldspar)

Chert (varietal Flint) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (varietal Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (likely Quartzose type) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (likely Quartzose type)

Clastic sedimentary rock (primarily SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Conglomerate (Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)) — sedimentary

Conglomerate

Conglomerate (SiO2, Al2O3, Fe2O3, CaCo3)

Sandstone (Ferruginous) (Arenite (with iron oxide cement, Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Sandstone (Quartzite-rich Cobble) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich Cobble)

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with iron oxide Fe2O3 cement)

Yellow Calcite (Calcium Carbonate (CaCO3)) — mineral

Yellow Calcite

Calcium Carbonate (CaCO3)

Sandstone (Water-worn Cobble) (Arenite (SiO2 based)) — sedimentary

Sandstone (Water-worn Cobble)

Arenite (SiO2 based)

Sandstone (Ferruginous) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)) — sedimentary

Sandstone (Ferruginous)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)

Chert (Chalcedony/Agate) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Graphic Granite (Graphic Granite (a runic intergrowth of Quartz and Feldspar)) — igneous

Graphic Granite

Graphic Granite (a runic intergrowth of Quartz and Feldspar)

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (tumbled/river-worn) (Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)) — igneous

Basalt (tumbled/river-worn)

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

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

Vesicular Basalt (River Rock)

Afanitic Vesicular Basalt

Granitic Quartz (with Feldspar inclusions) (Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)) — igneous

Granitic Quartz (with Feldspar inclusions)

Quartz (SiO2) with Potassium Feldspar (KAlSi3O8)

Granite (Phaneritic Plutonic Felsic Rock) — igneous

Granite

Phaneritic Plutonic Felsic Rock

Amazonite (KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar) — mineral

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate) - a variety of Microcline Feldspar

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Milky Quartz Pebble with Iron staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble with Iron staining

Silicon Dioxide (SiO2)