Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

Browse metamorphic (altered igneous rock) specimens identified by the Rock Identifier community.

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Sodalite (Sodalite (Na8(Al6Si6O24)Cl2)) — mineral

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Pyrite (Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Black Tourmaline (Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)) — mineral

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Blue Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Apatite (Apatite-(CaF), Ca5(PO4)3F) — mineral

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Peach Moonstone (Orthoclase Feldspar (KAlSi3O8)) — mineral

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Quartz (Yellow/Citrine variety) (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz (Yellow/Citrine variety)

Crystalline Silicon Dioxide (SiO2)

Pyrite (locally known as Fool's Gold) (Iron Sulfide (FeS2)) — mineral

Pyrite (locally known as Fool's Gold)

Iron Sulfide (FeS2)

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

Quartzite River Rock

Metamorphic Quartzite (SiO2)

Garnet (Almandine) (Almandine, Fe3Al2(SiO4)3) — metamorphic

Garnet (Almandine)

Almandine, Fe3Al2(SiO4)3

Garnet Schist (Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)) — metamorphic

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Unakite (Epidotized Granite) (Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)) — Metamorphic

Unakite (Epidotized Granite)

Unakite; primarily composed of Epidote (Ca2(Al,Fe)3(SiO4)3(OH)), Orthoclase (KAlSi3O8), and Quartz (SiO2)

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)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Quartz-veined Schist (or Metasandstone) (Metamorphic Rock with Quartz Veining (SiO2)) — metamorphic

Quartz-veined Schist (or Metasandstone)

Metamorphic Rock with Quartz Veining (SiO2)

Unakite (Epidote with Quartz and Feldspar) (Unakite (Metasomatized Granitic Rock)) — metamorphic

Unakite (Epidote with Quartz and Feldspar)

Unakite (Metasomatized Granitic Rock)

Quartzite pebble (Quartzite (SiO2)) — metamorphic

Quartzite pebble

Quartzite (SiO2)

Pink Garnet (likely Almandine or Rhodolite) (Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)) — mineral

Pink Garnet (likely Almandine or Rhodolite)

Garnet Group (Fe3Al2(SiO4)3 to Mg3Al2(SiO4)3)

Quartzite Pebble (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic Quartzite (SiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Quartz on Schist (Silicon Dioxide (SiO2) on Foliated Metamorphic Rock) — metamorphic

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Gray Agate (Cryptocrystalline Quartz (SiO2)) — mineral

Gray Agate

Cryptocrystalline Quartz (SiO2)

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

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Porphyry (Porphyritic Rock) — igneous

Porphyry

Porphyritic Rock

Pink Granite (Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)) — igneous

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Mica Schist with Garnet (Garnetiferous Mica Schist) — metamorphic

Mica Schist with Garnet

Garnetiferous Mica Schist

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

Slate

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

Quartzite River Pebble (Quartzite (SiO2)) — metamorphic

Quartzite River Pebble

Quartzite (SiO2)

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye) (Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)) — metamorphic

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Schist (Mica Schist) — metamorphic

Schist

Mica Schist

Serpentine (Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)) — metamorphic

Serpentine

Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

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

Serpentine

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

Serpentine (Green Jasper variety) (Antigorite/Chrysotile, Mg3Si2O5(OH)4) — metamorphic

Serpentine (Green Jasper variety)

Antigorite/Chrysotile, Mg3Si2O5(OH)4

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Basalt (Beach Pebble) (Extrusive mafic igneous rock) — igneous

Basalt (Beach Pebble)

Extrusive mafic igneous rock

Basalt Pebble (Mafic Igneous Rock (Basalt)) — igneous

Basalt Pebble

Mafic Igneous Rock (Basalt)

Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

Basalt (Water-worn) (Aphanitic Mafic Igneous Rock) — Igneous

Basalt (Water-worn)

Aphanitic Mafic Igneous Rock