Rock Identifier

Category

Metamorphic Rock

Browse metamorphic rock specimens identified by the Rock Identifier community.

Learn about Metamorphic Rock in the encyclopedia

Calc-Silicate Rock

Calc-Silicate Rock

Eulysite

Metabasalt

Hornfels

Metarhyolite

Metagabbro

Talc-carbonate Rock

Talc-carbonate Rock

Rock Gypsum

Coral Rock

Rock Salt

Asphalt Rock

Amphibolite

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

Gneiss

Gneiss (High-grade metamorphic rock)

Granite Gneiss (Gneiss (high-grade metamorphic rock)) — metamorphic

Granite Gneiss

Gneiss (high-grade metamorphic rock)

Slate (Phyllo-silicate based metamorphic rock) — metamorphic

Slate

Phyllo-silicate based metamorphic rock

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

Gneiss

Gneiss (High-grade metamorphic rock)

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

Banded Gneiss

Gneiss (High-grade metamorphic rock)

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

Gneiss

Gneiss (High-grade Metamorphic Rock)

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

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Anthracite Coal (Anthracite (Carbon-rich metamorphic rock)) — metamorphic

Anthracite Coal

Anthracite (Carbon-rich metamorphic rock)

Banded Gneiss (with Quartz Vein) (Gneiss (Metamorphic rock of varying mineralogy)) — metamorphic

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)

Gneiss (High-grade foliated metamorphic rock) — metamorphic

Gneiss

High-grade foliated metamorphic rock

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

Gneiss

Gneiss (High-grade metamorphic rock)

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

Banded Gneiss

Gneiss (High-grade 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)

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

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss (River Cobble) (Gneiss (a high-grade metamorphic rock)) — metamorphic

Banded Gneiss (River Cobble)

Gneiss (a high-grade metamorphic rock)

Weathered gray-green rock fragment (Likely shale or mudstone; exact identification requires testing) — sedimentary

Weathered gray-green rock fragment

Likely shale or mudstone; exact identification requires testing

Dark slate or fine-grained metamorphic rock (Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar) — metamorphic

Dark slate or fine-grained metamorphic rock

Slate; chiefly fine-grained phyllosilicates, quartz, and feldspar

Quartzite Cobble (Quartzite (SiO2)) — metamorphic

Quartzite Cobble

Quartzite (SiO2)

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

Oyster shell fragment

Ostreidae shell; primarily calcite (CaCO₃)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Fuchsite (Green Muscovite) (K(Al,Cr)2(AlSi3O10)(OH)2) — Mineral

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Anthracite Coal (Anthracite (Carbon C)) — metamorphic

Anthracite Coal

Anthracite (Carbon C)

Mica schist, likely biotite–muscovite schist (Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.) — metamorphic

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Likely gneissic amphibolite or banded metamorphic rock (Hornblende–biotite gneiss/amphibolite; exact identification requires a fresh surface or thin section) — metamorphic

Likely gneissic amphibolite or banded metamorphic rock

Hornblende–biotite gneiss/amphibolite; exact identification requires a fresh surface or thin section

Garnet (almandine or pyrope variety) (Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3) — mineral

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Rounded basalt cobble (probable) (Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene) — igneous

Rounded basalt cobble (probable)

Basalt; fine-grained mafic volcanic rock, chiefly plagioclase and pyroxene

Weathered pegmatitic granite or feldspar-rich metamorphic rock (Quartz–feldspar rock, likely granitic pegmatite; exact identification requires testing) — igneous

Weathered pegmatitic granite or feldspar-rich metamorphic rock

Quartz–feldspar rock, likely granitic pegmatite; exact identification requires testing

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Slate (Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)) — metamorphic

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Pink Quartz (Inclusion-rich Quartzite) (SiO2 (Silicon Dioxide) with Iron Oxide / Hematite inclusions) — metamorphic

Pink Quartz (Inclusion-rich Quartzite)

SiO2 (Silicon Dioxide) with Iron Oxide / Hematite inclusions

Gold-bearing Quartz (Auriferous Quartz (SiO2 with Native Gold inclusion)) — mineral

Gold-bearing Quartz

Auriferous Quartz (SiO2 with Native Gold inclusion)

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar (Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite) — igneous

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar

Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite

Iron-rich quartzite or ferruginous metamorphic rock (Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)) — metamorphic

Iron-rich quartzite or ferruginous metamorphic rock

Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)

Iron-rich quartzite or ferruginous metamorphic rock (Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)) — metamorphic

Iron-rich quartzite or ferruginous metamorphic rock

Ferruginous quartzite, likely hematite/goethite-bearing quartzite; SiO₂ with Fe₂O₃/FeO(OH)

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

Gneiss

High-grade regional metamorphic rock (Foliated)

Quartz Vein in Matrix (Gneiss/Schist) (Silicon Dioxide (SiO2) in Metamorphic Rock Matrix) — metamorphic

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Schist (Mica Schist (Medium-grade Metamorphic Rock)) — Metamorphic

Schist

Mica Schist (Medium-grade Metamorphic Rock)

Mica Schist (Mica Schist (Quartz-Mica Metamorphic Rock)) — metamorphic

Mica Schist

Mica Schist (Quartz-Mica Metamorphic Rock)

Green Greenstone / Celadonite-bearing Metamorphic Rock (Greenschist / Celadonite / Serpentinitic pebble) — metamorphic

Green Greenstone / Celadonite-bearing Metamorphic Rock

Greenschist / Celadonite / Serpentinitic pebble

Likely slate or fine-grained metamorphic rock (Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz) — metamorphic

Likely slate or fine-grained metamorphic rock

Slate/phyllite; predominantly fine-grained mica, chlorite, and quartz

Serpentinite (likely serpentine-rich metamorphic rock) (Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite) — metamorphic

Serpentinite (likely serpentine-rich metamorphic rock)

Serpentine-group minerals, chiefly antigorite, lizardite, and/or chrysotile; commonly derived from altered peridotite