Rock Identifier

Category

Metamorphic (Altered Igneous Rock)

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

Quartzite Pebble (Quartzite (principally SiO2)) — metamorphic

Quartzite Pebble

Quartzite (principally SiO2)

Yellow Agate (Silicon Dioxide (SiO2)) — mineral

Yellow Agate

Silicon Dioxide (SiO2)

Eclogite (Eclogite (Omphacite + Almandine-Pyrope Garnet)) — metamorphic

Eclogite

Eclogite (Omphacite + Almandine-Pyrope Garnet)

Mica Schist (Crystalline Schist (often containing Muscovite, Biotite, and Quartz)) — metamorphic

Mica Schist

Crystalline Schist (often containing Muscovite, Biotite, and Quartz)

Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite Pebble

Quartzite (primarily SiO2)

Quartzite (River Pebble) (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite (River Pebble)

Metamorphosed Quartz Sandstone (SiO2)

Iron-stained Quartzite (Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)) — metamorphic

Iron-stained Quartzite

Quartzite with Limonite/Hematite staining (SiO2 with FeO(OH)·nH2O)

Quartzite Pebble (Recrystallized Quartz (SiO2)) — metamorphic

Quartzite Pebble

Recrystallized Quartz (SiO2)

Greenstone (Chlorite schist / Meta-basalt) — metamorphic

Greenstone

Chlorite schist / Meta-basalt

Unakite (Epidotized Granite) — metamorphic

Unakite

Epidotized Granite

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

Granite

Granite (Phaneritic intrusive igneous rock)

Gossan (Iron Hat) (Limonitic Gossan (predominantly FeO(OH)·nH2O)) — igneous/metamorphic derivative

Gossan (Iron Hat)

Limonitic Gossan (predominantly FeO(OH)·nH2O)

igneous/metamorphic derivative

Serpentinite (Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)) — metamorphic

Serpentinite

Serpentinite (complex silicate minerals including Lizardite, Antigorite, and Chrysotile)

Serpentine (Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4

River Cobble (Quartzite with Iron Staining) (Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)) — metamorphic

River Cobble (Quartzite with Iron Staining)

Metamorphic Quartzite (SiO2 with Fe2O3 inclusions)

Smoky Quartz (Crystalline Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Crystalline Silicon Dioxide (SiO2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

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

Muscovite Mica (with Quartz) (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite (Magnetite (Fe3O4)) — mineral

Magnetite

Magnetite (Fe3O4)

River Pebble (Quartzite or Chert) (Silicon Dioxide (SiO2)) — metamorphic or sedimentary

River Pebble (Quartzite or Chert)

Silicon Dioxide (SiO2)

metamorphic or sedimentary

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

Quartz (Milky Quartz)

Quartz (Silicon Dioxide, SiO2)

Vesicular Basalt (Aphanitic Mafic Igneous Rock (with Vesicular Texture)) — igneous

Vesicular Basalt

Aphanitic Mafic Igneous Rock (with Vesicular Texture)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

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

Serpentinite

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

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Serpentine (Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4) — metamorphic

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Unakite (Unakite-Epidote Granite) — metamorphic

Unakite

Unakite-Epidote Granite

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Unakite (Unakite (metasomatized granite)) — metamorphic

Unakite

Unakite (metasomatized granite)

Serpentine (Serpentinite) (Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4) — metamorphic

Serpentine (Serpentinite)

Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4

Unakite (Unakite (Epidotized Granite)) — metamorphic

Unakite

Unakite (Epidotized Granite)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Unakite (Unakite (Episyenite composition: Feldspar, Epidote, and Quartz)) — metamorphic

Unakite

Unakite (Episyenite composition: Feldspar, Epidote, and Quartz)

Red Quartzite (Ferruginous Quartz) (Quartzite (SiO2 with Fe2O3 inclusions)) — metamorphic

Red Quartzite (Ferruginous Quartz)

Quartzite (SiO2 with Fe2O3 inclusions)

Quartzite with Garnet (Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)) — metamorphic

Quartzite with Garnet

Garnetiferous Quartzite (SiO2 + X3Y2(SiO4)3)

Quartzite (River Pebble) (SiO2 (recrystallized Quartz)) — metamorphic

Quartzite (River Pebble)

SiO2 (recrystallized Quartz)

Basalt River Cobble (Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)) — igneous

Basalt River Cobble

Extrusive Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Basalt (Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)) — igneous

Basalt

Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)