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

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

Agate

Silicon dioxide (Chalcedony), SiO2

Agate (Chalcedony (SiO2)) — sedimentary

Agate

Chalcedony (SiO2)

Jasper (Silicon dioxide (Microcrystalline quartz, SiO2)) — sedimentary

Jasper

Silicon dioxide (Microcrystalline quartz, SiO2)

Black Tourmaline (Schorl (complex sodium iron aluminum borosilicate)) — mineral

Black Tourmaline

Schorl (complex sodium iron aluminum borosilicate)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Travertine (Calcium Carbonate (CaCO3)) — sedimentary

Travertine

Calcium Carbonate (CaCO3)

Common Opal (Hydrated amorphous silica (SiO2·nH2O)) — mineral

Common Opal

Hydrated amorphous silica (SiO2·nH2O)

Chalcedony / Agate Nodule (Silicon Dioxide (SiO2)) — sedimentary

Chalcedony / Agate Nodule

Silicon Dioxide (SiO2)

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

Flint (or Chert)

Silicon dioxide (Microcrystalline Quartz, $SiO_2$)

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

Chrysocolla in Chalcedony (Gem Silica) (Hydrated copper phyllosilicate and silicon dioxide (SiO2 with (Cu,Al)2H2Si2O5(OH)4)) — mineral

Chrysocolla in Chalcedony (Gem Silica)

Hydrated copper phyllosilicate and silicon dioxide (SiO2 with (Cu,Al)2H2Si2O5(OH)4)

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

Chert / Flint

Microcrystalline Quartz (SiO2)

Stromatolite (Biogenic sedimentary rock) — sedimentary

Stromatolite

Biogenic sedimentary rock

Green Jasper / Metavesuvianite-bearing rock (Silica-rich microcrystalline quartz aggregate / Green Jasper) — igneous

Green Jasper / Metavesuvianite-bearing rock

Silica-rich microcrystalline quartz aggregate / Green Jasper

Fossilized Echinoid / Sea Urchin Internal Mold (Echinoidea internal cast (steinkern)) — fossil

Fossilized Echinoid / Sea Urchin Internal Mold

Echinoidea internal cast (steinkern)

Fossiliferous Limestone (Bioclastic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Vanadinite (Vanadinite (Pb5(VO4)3Cl)) — mineral

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Greenstone (Prase / Metavolcanic) (Metamorphosed volcanic rock (Greenstone)) — metamorphic

Greenstone (Prase / Metavolcanic)

Metamorphosed volcanic rock (Greenstone)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Unakite (Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz) — metamorphic

Unakite

Granitic rock composed of pink orthoclase feldspar, green epidote, and clear quartz

Stromatolite (Biogenic sedimentary rock / Stromatolite) — sedimentary

Stromatolite

Biogenic sedimentary rock / Stromatolite

Vein Quartz in Basalt or Mafic Rock (Silicon Dioxide (Quartz veins in volcanic host rock)) — igneous

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Quartz Vein in Host Rock (Silicon dioxide (SiO2) veins in metamorphic/igneous host rock) — igneous

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Basalt Pebble (Aphanitic mafic extrusive igneous rock) — igneous

Basalt Pebble

Aphanitic mafic extrusive igneous rock

Hag Stone (Perforated sedimentary rock (typically limestone, sandstone, or flint)) — sedimentary

Hag Stone

Perforated sedimentary rock (typically limestone, sandstone, or flint)

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

Jasper / Flint / Chert

Microcrystalline Quartz (SiO2)

Flint (Microcrystalline quartz (SiO2)) — sedimentary

Flint

Microcrystalline quartz (SiO2)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Crescent Pebble (Weathered Quartzite or Sandstone Fragment) — sedimentary

Crescent Pebble

Weathered Quartzite or Sandstone Fragment

Petrified Wood with Lichen (Silicified Wood (SiO2) colonized by crustose lichens) — fossil

Petrified Wood with Lichen

Silicified Wood (SiO2) colonized by crustose lichens

Sandstone (Sedimentary Clastic Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz arenite)

Petrified Wood (Silicified wood (Quartz / Chalcedony replacement)) — fossil

Petrified Wood

Silicified wood (Quartz / Chalcedony replacement)

Petrified Wood (Silicified Wood / Xylopal (SiO2)) — fossil

Petrified Wood

Silicified Wood / Xylopal (SiO2)

Septarian Nodule (Septarian Concretion (Calcite, Aragonite, and Limestone)) — sedimentary

Septarian Nodule

Septarian Concretion (Calcite, Aragonite, and Limestone)

Blue Topaz (Al2SiO4(F,OH)2) — gemstone

Blue Topaz

Al2SiO4(F,OH)2

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Flint / Chert (Silicon dioxide (Microcrystalline quartz, SiO2)) — sedimentary

Flint / Chert

Silicon dioxide (Microcrystalline quartz, SiO2)

Turquoise (CuAl6(PO4)4(OH)8·4H2O) — gemstone

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Diamond (Carbon (C)) — gemstone

Diamond

Carbon (C)

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)