Rock Identifier

Category

Igneous, Sedimentary, Metamorphic

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

Learn about Igneous, Sedimentary, Metamorphic in the encyclopedia

Cordierite Hornfels

Cordierite Hornfels

Migmatite

Hornblende Schist

Hornblende Schist

Goldmanite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Fragment (Quartz (Silicon Dioxide, SiO2)) — mineral

Clear Quartz Fragment

Quartz (Silicon Dioxide, SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Green Schist (Greenschist (Chlorite Schist)) — metamorphic

Green Schist

Greenschist (Chlorite Schist)

Epidote with Quartz (Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)) — mineral

Epidote with Quartz

Ca2(Al,Fe)3(SiO4)3(OH) (Epidote) / SiO2 (Quartz)

Baked-clay ceramic fragment (likely brick or pottery) (Fired clay, primarily aluminosilicate minerals; not a natural rock) — sedimentary

Baked-clay ceramic fragment (likely brick or pottery)

Fired clay, primarily aluminosilicate minerals; not a natural rock

Gneiss (Gneiss (Metamorphic Rock)) — metamorphic

Gneiss

Gneiss (Metamorphic Rock)

Gneiss (Foliated Metamorphic Rock) — metamorphic

Gneiss

Foliated Metamorphic Rock

Gneiss (High-grade Metamorphic Gneiss) — metamorphic

Gneiss

High-grade Metamorphic Gneiss

Fossilized bone fragment (probable mammalian tooth or bone) (Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite) — fossil

Fossilized bone fragment (probable mammalian tooth or bone)

Mineralized bone, commonly hydroxyapatite [Ca5(PO4)3(OH)] replaced or impregnated by silica/calcite

Mixed river stones; foreground likely sandstone (Quartz-rich sandstone, with associated rounded quartzite/chert and other cobbles) — sedimentary

Mixed river stones; foreground likely sandstone

Quartz-rich sandstone, with associated rounded quartzite/chert and other cobbles

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

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

Epidote

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

River Cobble (Gneiss/Schist mix) (Foliated Metamorphic Rock (Gneissic/Schistose)) — metamorphic

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

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 gneissic rock (Gneiss, likely quartz–feldspar–biotite gneiss) — metamorphic

Banded gneissic rock

Gneiss, likely quartz–feldspar–biotite gneiss

Garnet in Host Rock (Garnet Group (A3B2(SiO4)3)) — metamorphic

Garnet in Host Rock

Garnet Group (A3B2(SiO4)3)

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

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic

Gneiss (Augen Gneiss) (Augen Gneiss) — metamorphic

Gneiss (Augen Gneiss)

Augen Gneiss

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

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz-rich rock, possibly milky quartz or quartzite fragment (Quartz (SiO₂), potentially quartzite if metamorphic) — mineral

Quartz-rich rock, possibly milky quartz or quartzite fragment

Quartz (SiO₂), potentially quartzite if metamorphic

Mica / Muscovite or Biotite (Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)) — mineral

Mica / Muscovite or Biotite

Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)

Magnetite (Loadstone candidate) (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Fossilized shell fragment, likely bivalve (Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material) — fossil

Fossilized shell fragment, likely bivalve

Bivalvia indet.; commonly preserved as calcite (CaCO₃) shell material

Epidote-bearing Rock / Epidote Inclusion (Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock) — mineral

Epidote-bearing Rock / Epidote Inclusion

Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

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

Gneiss (High-grade Metamorphic Gneiss) — metamorphic

Gneiss

High-grade Metamorphic Gneiss

Hematite (Iron Oxide (Fe2O3)) — mineral

Hematite

Iron Oxide (Fe2O3)

Gneiss (Gneissic Metamorphic Rock) — metamorphic

Gneiss

Gneissic Metamorphic Rock

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble (Silicon dioxide (SiO2)) — sedimentary

Quartz pebble

Silicon dioxide (SiO2)

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)

Gneiss (Gneiss) — metamorphic

Gneiss

Gneiss

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

Gneiss

Gneiss (High-grade metamorphic rock)

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))