Rock Identifier

Category

Igneous, Metamorphic, Sedimentary

Browse igneous, metamorphic, sedimentary specimens identified by the Rock Identifier community.

Learn about Igneous, Metamorphic, Sedimentary in the encyclopedia

Cordierite Hornfels

Cordierite Hornfels

Migmatite

Hornblende Schist

Hornblende Schist

Goldmanite

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Ruby in Zoisite (Zoisite with Corundum (Ca2Al3(SiO4)(Si2O7)O(OH) + Al2O3)) — metamorphic

Ruby in Zoisite

Zoisite with Corundum (Ca2Al3(SiO4)(Si2O7)O(OH) + Al2O3)

Ruby in Zoisite (Anyolite (Ruby in Zoisite)) — metamorphic

Ruby in Zoisite

Anyolite (Ruby in Zoisite)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Quartz vein fragment (Milky quartz (SiO₂), possibly with weathered host rock) — metamorphic

Quartz vein fragment

Milky quartz (SiO₂), possibly with weathered host rock

Hematite (Iron Oxide (Fe2O3)) — mineral

Hematite

Iron Oxide (Fe2O3)

Coarse-grained granite (Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende) — igneous

Coarse-grained granite

Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende

Weathered fossiliferous limestone, likely coral or shell fragment (Calcite (CaCO₃), biogenic limestone; exact fossil taxon indeterminate from the image) — fossil

Weathered fossiliferous limestone, likely coral or shell fragment

Calcite (CaCO₃), biogenic limestone; exact fossil taxon indeterminate from the image

Banded metamorphic rock, likely gneiss (Biotite–quartz–feldspar gneiss, possibly migmatitic) — metamorphic

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic

Biotite Schist (Metamorphic Rock (Schist)) — metamorphic

Biotite Schist

Metamorphic Rock (Schist)

Banded Gneiss Pebble (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Banded Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Gneiss (Metamorphic Rock)

Granitic Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Granitic Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss (Banded Gneiss (Metamorphic Rock)) — metamorphic

Banded Gneiss

Banded Gneiss (Metamorphic Rock)

Gneiss (Gneiss (foliated metamorphic rock)) — metamorphic

Gneiss

Gneiss (foliated metamorphic rock)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

River Stone (River Pebble) (River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)) — sedimentary

River Stone (River Pebble)

River Stone (Composition: primarily Quartzite, Chalcedony, and silicate minerals)

Garnet (Almandine variety) (Almandine Garnet (Fe3Al2(SiO4)3)) — mineral

Garnet (Almandine variety)

Almandine Garnet (Fe3Al2(SiO4)3)

Green Mica Schist (Mica Schist (Fuchsite or Chlorite variety)) — metamorphic

Green Mica Schist

Mica Schist (Fuchsite or Chlorite variety)

Epidote (Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))) — metamorphic

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Biotite Schist (Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)) — metamorphic

Biotite Schist

Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

Gneiss (High-grade regional metamorphic rock (Foliated)) — metamorphic

Gneiss

High-grade regional metamorphic rock (Foliated)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Fossiliferous limestone (likely crinoidal or shell limestone) (Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments) — fossil

Fossiliferous limestone (likely crinoidal or shell limestone)

Calcite-rich limestone; predominantly CaCO₃, with visible fossil fragments

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

Schist (Chlorite/Mica Schist) — metamorphic

Schist

Chlorite/Mica Schist

Banded Gneiss (Gneiss (SiO2 enriched metamorphic rock)) — metamorphic

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Polished banded gneiss pebble (Gneiss, commonly quartz–feldspar–biotite gneiss) — metamorphic

Polished banded gneiss pebble

Gneiss, commonly quartz–feldspar–biotite gneiss

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Raw selenite (gypsum) (Gypsum, CaSO₄·2H₂O; translucent variety selenite) — mineral

Raw selenite (gypsum)

Gypsum, CaSO₄·2H₂O; translucent variety selenite

Oyster shell fragment (Ostreidae shell; primarily calcite (CaCO₃)) — fossil

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

Greenstone / Greenschist (Greenschist facies metamorphic rock) — metamorphic

Greenstone / Greenschist

Greenschist facies metamorphic rock

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss (Gneiss (High-grade Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (High-grade Metamorphic Rock)

Garnet in Matrix (Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix) — metamorphic

Garnet in Matrix

Almandine or Pyrope Garnet (X3Y2(SiO4)3) in Schist or Eclogite matrix

Likely milky quartz pebble (Quartz (silicon dioxide, SiO₂)) — mineral

Likely milky quartz pebble

Quartz (silicon dioxide, SiO₂)

Quartz with iron staining (Silicon dioxide (SiO2)) — mineral

Quartz with iron staining

Silicon dioxide (SiO2)

Clear quartz crystals (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz crystals

Quartz (silicon dioxide, SiO₂)