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

Fossil Coral (Hexagonaria (Rugose coral) / Rugosa) — fossil

Fossil Coral

Hexagonaria (Rugose coral) / Rugosa

Petrified Coral Fossil (Honeycomb Coral) (Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)) — fossil

Petrified Coral Fossil (Honeycomb Coral)

Favosites (Rugosa/Tabulate coral fossil replaced by microcrystalline quartz/chalcedony)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) — mineral

Epidote

Ca2(Al,Fe)3(SiO4)3(OH)

Petoskey Stone (Hexagonaria percarinata) — fossil

Petoskey Stone

Hexagonaria percarinata

Jasper with Purple Fluorite or Chalcedony (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Jasper with Purple Fluorite or Chalcedony

Silicon Dioxide (SiO2) with mineral inclusions

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

Granite Boulder (Felsic Intrusive Igneous Rock) — igneous

Granite Boulder

Felsic Intrusive Igneous Rock

Quartzite Pebble (Metamorphic Quartz Sandstone (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartz Sandstone (SiO2)

Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Granite Pebble (Intrusive igneous rock (Quartz, Feldspar, Mica)) — igneous

Granite Pebble

Intrusive igneous rock (Quartz, Feldspar, Mica)

Chrysoprase (Chalcedony (SiO2)) — gemstone

Chrysoprase

Chalcedony (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Chrysoprase (Chalcedony (Silicon Dioxide, SiO2)) — gemstone

Chrysoprase

Chalcedony (Silicon Dioxide, SiO2)

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

Common Opal

Hydrated amorphous silica (SiO2·nH2O)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Flint (Microcrystalline Quartz (SiO2)) — sedimentary

Flint

Microcrystalline Quartz (SiO2)

Fossil Coral (Hexagonaria / Rugose coral (Fossilized calcium carbonate)) — fossil

Fossil Coral

Hexagonaria / Rugose coral (Fossilized calcium carbonate)

Fossilized Coral (Petoskey Stone or similar Rugose Coral) (Hexagonaria percarinata (or similar Rugose/Tabulate coral)) — fossil

Fossilized Coral (Petoskey Stone or similar Rugose Coral)

Hexagonaria percarinata (or similar Rugose/Tabulate coral)

Fossilized Coral (Rugose coral / Tabulate coral fossil in limestone matrix) — fossil

Fossilized Coral

Rugose coral / Tabulate coral fossil in limestone matrix

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Pumice (Pumice (Volcanic Glass Foam)) — igneous

Pumice

Pumice (Volcanic Glass Foam)

Diorite (Intermediate plutonic igneous rock) — igneous

Diorite

Intermediate plutonic igneous rock

Fossil Coral (Rugose Coral or Tabulate Coral (Phylum Cnidaria)) — fossil

Fossil Coral

Rugose Coral or Tabulate Coral (Phylum Cnidaria)

Jasper Pebble (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper Pebble

Microcrystalline Quartz (SiO2)

Fossilized Coral (Rugose or Tabulate Coral) (Phylum Cnidaria, Class Anthozoa (silicified or calcified coral fossil)) — fossil

Fossilized Coral (Rugose or Tabulate Coral)

Phylum Cnidaria, Class Anthozoa (silicified or calcified coral fossil)

Brachiopod Fossil in Sedimentary Rock (Phylum Brachiopoda fossil imprint in sedimentary matrix) — fossil

Brachiopod Fossil in Sedimentary Rock

Phylum Brachiopoda fossil imprint in sedimentary matrix

Fossilized Coral (Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)) — fossil

Fossilized Coral

Hexagonaria (Rugose coral) / Calcium Carbonate (CaCO3)

Petoskey Stone / Fossilized Coral (Hexagonaria percarinata) — fossil

Petoskey Stone / Fossilized Coral

Hexagonaria percarinata

Fossilized Coral (Rugosa / Tabulata coral fossils replaced by silica (Chalcedony/Quartz)) — fossil

Fossilized Coral

Rugosa / Tabulata coral fossils replaced by silica (Chalcedony/Quartz)

Fossil Coral (Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)) — fossil

Fossil Coral

Hexagonaria or similar rugose/tabulate coral fossil (Calcium Carbonate, CaCO3)

Amygdaloidal Basalt (Extrusive mafic igneous rock with amygdules) — igneous

Amygdaloidal Basalt

Extrusive mafic igneous rock with amygdules

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Conglomerate (Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)) — sedimentary

Conglomerate

Clastic sedimentary rock (Polymict conglomerate with quartz/calcite matrix)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Jasper / Quartz Pebble (Silicon dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper / Quartz Pebble

Silicon dioxide (SiO2) microcrystalline quartz

Copper-bearing Basalt with Epidote and Quartz (Native copper in basalt amygdaloidal matrix) — igneous

Copper-bearing Basalt with Epidote and Quartz

Native copper in basalt amygdaloidal matrix

Porphyritic Basalt or Porphyry (Porphyritic Extrusive Igneous Rock) — igneous

Porphyritic Basalt or Porphyry

Porphyritic Extrusive Igneous Rock

Heart-shaped Quartzite or Sandstone Pebble (Quartz-rich sedimentary rock (Quartzite / Sandstone)) — sedimentary

Heart-shaped Quartzite or Sandstone Pebble

Quartz-rich sedimentary rock (Quartzite / Sandstone)

Basalt (Extrusive Igneous Rock) — igneous

Basalt

Extrusive Igneous Rock