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

Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

Pyrite and Calcite (or Barite) Specimen (Iron Sulfide (FeS2) with Calcium Carbonate (CaCO3)) — mineral

Pyrite and Calcite (or Barite) Specimen

Iron Sulfide (FeS2) with Calcium Carbonate (CaCO3)

Basalt Pebble (Extrusive Igneous Rock) — igneous

Basalt Pebble

Extrusive Igneous Rock

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Porphyritic Basalt or Porphyritic Andesite (Porphyritic volcanic rock) — igneous

Porphyritic Basalt or Porphyritic Andesite

Porphyritic volcanic rock

Quartzite (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (primarily SiO2)

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

White Quartz

Quartz (Silicon Dioxide, SiO2)

Epidote in Quartz (Epidote [Ca2(Al, Fe)3(SiO4)3(OH)] in Quartz [SiO2]) — gemstone

Epidote in Quartz

Epidote [Ca2(Al, Fe)3(SiO4)3(OH)] in Quartz [SiO2]

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

Turquoise in Matrix

CuAl6(PO4)4(OH)8·4H2O

Mahogany Obsidian (Volcanic Glass (SiO2 with iron and magnesium oxides)) — igneous

Mahogany Obsidian

Volcanic Glass (SiO2 with iron and magnesium oxides)

Jasper and Epidote in Quartzite (Metamorphic rock containing microcrystalline quartz, epidote, and jasper) — metamorphic

Jasper and Epidote in Quartzite

Metamorphic rock containing microcrystalline quartz, epidote, and jasper

Amazonite (Microcline (Potassium Feldspar) - KAlSi3O8) — mineral

Amazonite

Microcline (Potassium Feldspar) - KAlSi3O8

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

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

Jasper Arrowhead (Flint/Chert)

Microcrystalline Quartz (SiO2)

Rainbow Quartz (Dyed/Coated Quartz) (Silicon Dioxide (SiO2) with artificial color enhancement) — gemstone

Rainbow Quartz (Dyed/Coated Quartz)

Silicon Dioxide (SiO2) with artificial color enhancement

Quartz Crystal Cluster (Silicon Dioxide (SiO2)) — mineral

Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Blue Quartz (Silicon Dioxide (SiO2) with inclusions) — mineral

Blue Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz Vein in Basalt or Mafic Rock (Silicon Dioxide (SiO2) vein in volcanic/mafic matrix) — igneous

Quartz Vein in Basalt or Mafic Rock

Silicon Dioxide (SiO2) vein in volcanic/mafic matrix

Lapis Lazuli (Complex silicate rock containing lazurite, pyrite, and calcite) — gemstone

Lapis Lazuli

Complex silicate rock containing lazurite, pyrite, and calcite

Basalt Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt Pebble

Aphanitic Mafic Igneous Rock

Amethyst (Quartz (SiO2)) — mineral

Amethyst

Quartz (SiO2)

Lapis Lazuli (Complex silicate rock (lazurite, pyrite, calcite)) — gemstone

Lapis Lazuli

Complex silicate rock (lazurite, pyrite, calcite)

Granite (Intrusive Igneous Rock) — igneous

Granite

Intrusive Igneous Rock

Flint (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Flint

Silicon dioxide (SiO2) - Microcrystalline Quartz

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

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Obsidian (Volcanic Glass (Amorphous Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Amazonite (Microcline Feldspar (KAlSi3O8)) — mineral

Amazonite

Microcline Feldspar (KAlSi3O8)

Serpentine (Antigorite/Chrysotile/Lizardite (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite/Chrysotile/Lizardite (Mg,Fe)3Si2O5(OH)4

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

Agate

Silicon Dioxide (Chalcedony), SiO2

Orange Calcite (Calcium Carbonate (CaCO3)) — mineral

Orange Calcite

Calcium Carbonate (CaCO3)

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

Quartz (Milky or Chalcedony)

Silicon Dioxide (SiO2)

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Selenite (Gypsum (CaSO4·2H2O)) — mineral

Selenite

Gypsum (CaSO4·2H2O)

Pink Coral (Corallium rubrum (or related species, composed of calcium carbonate)) — gemstone

Pink Coral

Corallium rubrum (or related species, composed of calcium carbonate)

Chalcedony / Agate with Botryoidal Quartz (Silicon Dioxide (SiO2)) — sedimentary

Chalcedony / Agate with Botryoidal Quartz

Silicon Dioxide (SiO2)

Unakite (Altered Granite (Epidotized Granite)) — metamorphic

Unakite

Altered Granite (Epidotized Granite)

Titanium Coated Quartz (Aura Quartz) (Silicon dioxide with titanium vapor deposition (SiO2)) — mineral

Titanium Coated Quartz (Aura Quartz)

Silicon dioxide with titanium vapor deposition (SiO2)

Calcite (Calcium Carbonate (CaCO3)) — mineral

Calcite

Calcium Carbonate (CaCO3)

Peacock Ore (Bornite (Cu5FeS4)) — mineral

Peacock Ore

Bornite (Cu5FeS4)

Howlite (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

Larimar (Pectolite (Sodium Calcium Silicate Hydroxide, NaCa2Si3O8(OH))) — gemstone

Larimar

Pectolite (Sodium Calcium Silicate Hydroxide, NaCa2Si3O8(OH))