Rock Identifier

Community gallery

All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Explore the rock & mineral encyclopedia

Acanthite

Achroite

Adinole

Adirondack Garnet

Adirondack Garnet

Adularia

Agate

Albite

Albitite

Alexandrite

Alkali Feldspar

Alkali Feldspar

Almandine Garnet

Almandine Garnet

Alnöite

Unakite (Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)) — igneous

Unakite

Altered Granite (composed of orthoclase feldspar, green epidote, and quartz)

Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Petoskey Stone (Hexagonaria percarinata) — fossil

Petoskey Stone

Hexagonaria percarinata

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Sea Glass (Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature) — mineral

Sea Glass

Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Carnelian Agate (Silicon dioxide (Chalcedony), SiO2) — mineral

Carnelian Agate

Silicon dioxide (Chalcedony), SiO2

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Quartzite (Metamorphic rock composed primarily of quartz (SiO2)) — metamorphic

Quartzite

Metamorphic rock composed primarily of quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Chert / Flint (Silicon dioxide (Microcrystalline Quartz, $SiO_2$)) — sedimentary

Chert / Flint

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Fossiliferous Limestone (Biogenic Sedimentary Rock / CaCO3 with fossil fragments) — sedimentary

Fossiliferous Limestone

Biogenic Sedimentary Rock / CaCO3 with fossil fragments

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Clastic sedimentary rock (Quartz arenite or arkose)) — sedimentary

Sandstone

Clastic sedimentary rock (Quartz arenite or arkose)

Unidentified Rock (Unknown) — sedimentary

Unidentified Rock

Unknown

Chert / Flint Nodule (Microcrystalline quartz (SiO2)) — sedimentary

Chert / Flint Nodule

Microcrystalline quartz (SiO2)

Limestone (Sedimentary Rock (Primarily CaCO3)) — sedimentary

Limestone

Sedimentary Rock (Primarily CaCO3)

Generic Rock Fragment (Rock Fragment) — sedimentary

Generic Rock Fragment

Rock Fragment

Basalt (Mafic extrusive igneous rock) — igneous

Basalt

Mafic extrusive igneous rock

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

Quartz / Agate Nodule

Silicon Dioxide (SiO2)

Limestone (Sedimentary rock composed primarily of calcium carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary rock composed primarily of calcium carbonate (CaCO3)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Jasper with Quartz Vein (Microcrystalline quartz (SiO2) with quartz infill) — sedimentary

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) with quartz infill

Chert (Flint) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline quartz (SiO2)

Flint / Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Flint / Chert

Microcrystalline Quartz (SiO2)

Sandstone (Sedimentary rock composed mainly of quartz sand grains) — sedimentary

Sandstone

Sedimentary rock composed mainly of quartz sand grains

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Gold in Quartz Matrix (Gold (Au) embedded in Quartz (SiO2)) — mineral

Gold in Quartz Matrix

Gold (Au) embedded in Quartz (SiO2)

Granite (Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase) — igneous

Granite

Intrusive igneous rock composed mainly of quartz, alkali feldspar, and plagioclase

Quartzite (Quartzite (Metamorphic Quartz Arenite)) — metamorphic

Quartzite

Quartzite (Metamorphic Quartz Arenite)

Red Jasper (Silicon dioxide (microcrystalline quartz, $SiO_2$)) — sedimentary

Red Jasper

Silicon dioxide (microcrystalline quartz, $SiO_2$)

Granite (Intrusive igneous rock) — igneous

Granite

Intrusive igneous rock

Chert / Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Flint

Microcrystalline Quartz (SiO2)

Basalt with Quartz Vein (Extrusive Igneous Rock / Volcanic Rock) — igneous

Basalt with Quartz Vein

Extrusive Igneous Rock / Volcanic Rock

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock