Rock Identifier

Community gallery

All rocks & minerals

Every specimen the Rock Identifier community has discovered, from desert agates to deep-sea basalts.

Hag Stone (Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)) — Sedimentary

Hag Stone

Naturally holed stone (typically sedimentary rock such as flint, limestone, or sandstone)

Sedimentary
Pumice or Tuff (Pumice / Tuff) — igneous

Pumice or Tuff

Pumice / Tuff

igneous
Coquina / Fossiliferous Limestone (Fossiliferous Limestone (CaCO3)) — Sedimentary

Coquina / Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Sedimentary
Granite (Granite (Phaneritic intrusive igneous rock)) — igneous

Granite

Granite (Phaneritic intrusive igneous rock)

igneous
Serpentine (Serpentine (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4) — metamorphic

Serpentine

Serpentine (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

metamorphic
Banded Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Banded Agate

Cryptocrystalline Quartz (SiO2)

mineral
Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
Rhodonite (Manganese silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese silicate (Mn,Fe,Mg,Ca)SiO3

mineral
Kyanite (Kyanite (Al2SiO5)) — mineral

Kyanite

Kyanite (Al2SiO5)

mineral
Rhodonite (Manganese Silicate (Mn,Fe,Mg,Ca)SiO3) — mineral

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

mineral
Banded Agate (Onyx type) (Silicon dioxide (SiO2)) — mineral

Banded Agate (Onyx type)

Silicon dioxide (SiO2)

mineral
Granite (Granite) — Igneous

Granite

Granite

Igneous
Snowflake Obsidian (Tumbled) (Obsidian with Cristobalite inclusions) — igneous

Snowflake Obsidian (Tumbled)

Obsidian with Cristobalite inclusions

igneous
Granite (Granite) — Igneous

Granite

Granite

Igneous
Epidote with quartz/feldspar (Epidote, Ca2(Al,Fe)3(SiO4)3(OH)) — metamorphic

Epidote with quartz/feldspar

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

metamorphic
Sandstone (Arenite) — Sedimentary

Sandstone

Arenite

Sedimentary
Sandstone (Arenite) — Sedimentary

Sandstone

Arenite

Sedimentary
River Rock (likely Basalt or Greywacke) (Basalt or Lithic Sandstone) — Igneous or Sedimentary (water-worn)

River Rock (likely Basalt or Greywacke)

Basalt or Lithic Sandstone

Igneous or Sedimentary (water-worn)
Serpentinite (Serpentinite (group of minerals: Antigorite, Lizardite, Chrysotile)) — metamorphic

Serpentinite

Serpentinite (group of minerals: Antigorite, Lizardite, Chrysotile)

metamorphic
Porphyritic Rhyolite or Andesite (Porphyry) (Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)) — igneous

Porphyritic Rhyolite or Andesite (Porphyry)

Porphyritic igneous rock (Composition depends on exact mineralogy, often Rhyolite or Andesite)

igneous
Amygdaloidal Basalt (Amygdaloidal Basalt) — Igneous

Amygdaloidal Basalt

Amygdaloidal Basalt

Igneous
Quartzite (Quartzite (mostly SiO2)) — Metamorphic

Quartzite

Quartzite (mostly SiO2)

Metamorphic
Porphyritic Basalt or Andesite (Porphyritic Basalt/Andesite) — Igneous

Porphyritic Basalt or Andesite

Porphyritic Basalt/Andesite

Igneous
Conglomerate (Conglomerate) — Sedimentary

Conglomerate

Conglomerate

Sedimentary
Granite or Felsic Intrusive Rock (weathered) (Granite) — Igneous

Granite or Felsic Intrusive Rock (weathered)

Granite

Igneous
Quartz with Mica (SiO2 (Quartz) with Potassium aluminum silicate (Muscovite)) — Mineral

Quartz with Mica

SiO2 (Quartz) with Potassium aluminum silicate (Muscovite)

Mineral
Granite or Pegmatite in host rock (Granitoid / Felsic Intrusive Rock) — Igneous

Granite or Pegmatite in host rock

Granitoid / Felsic Intrusive Rock

Igneous
Schist with Quartz Veins (Schist with Quartz (SiO2)) — metamorphic

Schist with Quartz Veins

Schist with Quartz (SiO2)

metamorphic
Fossiliferous Shale or Slate with Plant Fossils (Fossil-bearing argillaceous rock) — Sedimentary/Metamorphic

Fossiliferous Shale or Slate with Plant Fossils

Fossil-bearing argillaceous rock

Sedimentary/Metamorphic
Limestone (Limestone (Calcium Carbonate, CaCO3)) — Sedimentary

Limestone

Limestone (Calcium Carbonate, CaCO3)

Sedimentary
Granite (Granite) — Igneous

Granite

Granite

Igneous
Granite (Granite) — Igneous

Granite

Granite

Igneous
Schist (Schist) — Metamorphic

Schist

Schist

Metamorphic
Schist (Schist) — Metamorphic

Schist

Schist

Metamorphic
Schist (Schist) — metamorphic

Schist

Schist

metamorphic
Granitic Pegmatite Intrusion in Host Rock (Pegmatite dike in amphibolite or schist) — igneous and metamorphic

Granitic Pegmatite Intrusion in Host Rock

Pegmatite dike in amphibolite or schist

igneous and metamorphic
Greenstone (Metabasalt (Greenstone facies)) — metamorphic

Greenstone

Metabasalt (Greenstone facies)

metamorphic
Granite (Phaneritic plutonic igneous rock (SiO2 range 65-75%)) — igneous

Granite

Phaneritic plutonic igneous rock (SiO2 range 65-75%)

igneous
Gneiss (likely Granitic Gneiss) (Gneiss) — metamorphic

Gneiss (likely Granitic Gneiss)

Gneiss

metamorphic
Sandstone (Arenite) — sedimentary

Sandstone

Arenite

sedimentary
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Jasper Beads (Polished) (Silicon Dioxide (SiO2)) — sedimentary

Jasper Beads (Polished)

Silicon Dioxide (SiO2)

sedimentary