Rock Identifier

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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

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

Red Sandstone Pebble (Quartzose Sandstone) — sedimentary

Red Sandstone Pebble

Quartzose Sandstone

Granite (Felsic intrusive igneous rock) — igneous

Granite

Felsic intrusive igneous rock

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Sandstone Pebble (Quartzose Sandstone (Sedimentary Rock)) — sedimentary

Sandstone Pebble

Quartzose Sandstone (Sedimentary Rock)

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

Flint

SiO2 (Microcrystalline Quartz / Chert)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Unakite (Altered Granite (Granitic Metamorphic Rock)) — metamorphic

Unakite

Altered Granite (Granitic Metamorphic Rock)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock