Rock Identifier

Category

Rock

Browse rock specimens identified by the Rock Identifier community.

Learn about Rock in the encyclopedia

Rock Gypsum

Coral Rock

Asphalt Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Anorthosite

Cataclasite

Peridotite

Phosphorite

Gondite

Dunite

Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Jasper pebble (Silicon dioxide (SiO2) with iron oxide inclusions) — sedimentary (secondary classification: cryptocrystalline quartz)

Jasper pebble

Silicon dioxide (SiO2) with iron oxide inclusions

sedimentary (secondary classification: cryptocrystalline quartz)

Sandstone (Arenite (typically SiO2 based)) — sedimentary

Sandstone

Arenite (typically SiO2 based)

Sandstone (with potential Concretion or Fossil fragment) (Arenite (primarily SiO2)) — sedimentary

Sandstone (with potential Concretion or Fossil fragment)

Arenite (primarily SiO2)

Sedimentary Breccia (Breccia (Clastic Sedimentary Rock)) — sedimentary

Sedimentary Breccia

Breccia (Clastic Sedimentary Rock)

Granite (Phaneritic Igneous Rock (Granite)) — igneous

Granite

Phaneritic Igneous Rock (Granite)

White Quartz (Silicon Dioxide (SiO2)) — mineral

White Quartz

Silicon Dioxide (SiO2)

Granite (Granite (Phaneritic Quartz-Feldspar Plutonic Rock)) — igneous

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Granite Cobble (Granite (Phaneritic Igneous Rock)) — igneous

Granite Cobble

Granite (Phaneritic Igneous Rock)

Granite (Phaneritic Igneous Rock (Granitic)) — igneous

Granite

Phaneritic Igneous Rock (Granitic)

Serpentine (Lizardite) (Serpentine subgroup, Mg3Si2O5(OH)4) — metamorphic

Serpentine (Lizardite)

Serpentine subgroup, Mg3Si2O5(OH)4

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Pink Granite (Granite (Alkali Feldspar Granite)) — igneous

Pink Granite

Granite (Alkali Feldspar Granite)

Basalt River Stone (Basalt (Mafic volcanic rock)) — igneous

Basalt River Stone

Basalt (Mafic volcanic rock)

Basalt (Vesicular) (Basalt (Mafic volcanic rock)) — igneous

Basalt (Vesicular)

Basalt (Mafic volcanic rock)

Quartz Druze on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Granodiorite (Granodiorite (phaneritic intrusive igneous rock)) — igneous

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Quartzite / Chert Nodular Rock (Silicon Dioxide (SiO2) / Microcrystalline Quartz) — sedimentary

Quartzite / Chert Nodular Rock

Silicon Dioxide (SiO2) / Microcrystalline Quartz

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Amygdaloidal Basalt with Agate/Quartz Infill (Basalt with Secondary Silicate Mineralization (SiO2)) — igneous

Amygdaloidal Basalt with Agate/Quartz Infill

Basalt with Secondary Silicate Mineralization (SiO2)

Quartz Vein on Matrix (Silicon Dioxide (SiO2)) — mineral

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Boulder Opal (Hydrated amorphous silica (SiO2·nH2O) in ironstone matrix) — mineral

Boulder Opal

Hydrated amorphous silica (SiO2·nH2O) in ironstone matrix

Limestone (Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Calcium Carbonate (CaCO3)

Vesicular Basalt (Lava Rock) (Vesicular basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular basalt

Vesicular Basalt (Lava Rock) (Vesicular Basalt) — igneous

Vesicular Basalt (Lava Rock)

Vesicular Basalt

River Rock (Quartzite) (Quartzite (SiO2)) — metamorphic

River Rock (Quartzite)

Quartzite (SiO2)

Limestone with Lichen (Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen) — sedimentary

Limestone with Lichen

Calcium Carbonate (CaCO3) with Endolithic/Epilithic Lichen

Basalt (Basalt) — igneous

Basalt

Basalt

Basalt (Basalt) — igneous

Basalt

Basalt

Blue Chalcedony (Moonstone-like / Agate) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — gemstone

Blue Chalcedony (Moonstone-like / Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Obsidian (Volcanic Glass (SiO2 with impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 with impurities)

Sandstone (with potential fossil fragments) (Sandstone (SiO2 dominated with iron oxides)) — sedimentary

Sandstone (with potential fossil fragments)

Sandstone (SiO2 dominated with iron oxides)

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

Chert Nodule / Flint

Microcrystalline Quartz (SiO2)

Kaolinite (China Clay / Chalky Claystone) (Al2Si2O5(OH)4) — mineral

Kaolinite (China Clay / Chalky Claystone)

Al2Si2O5(OH)4

Agate (Carnelian type) (Silicon Dioxide (SiO2)) — mineral

Agate (Carnelian type)

Silicon Dioxide (SiO2)

Biotite (Black Mica) (Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2) — mineral

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(F,OH)2

Travertine (Calcium Carbonate (CaCO3)) — sedimentary

Travertine

Calcium Carbonate (CaCO3)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Rose Quartz (Silicon Dioxide (SiO2) with trace titanium, iron, or manganese) — mineral

Rose Quartz

Silicon Dioxide (SiO2) with trace titanium, iron, or manganese

Chert (Nodule) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Nodule)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Turquoise (CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)) — mineral

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)