Gneiss
Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)
Category
Browse metamorphic and sedimentary specimens identified by the Rock Identifier community.
Gneiss
Gneiss (Metamorphic rock dominated by Quartz, Feldspar, and various dark minerals)
Gneiss
Gneiss
Gneiss
Gneiss
Mica Schist
Mica Schist (primarily Muscovite and/or Biotite composition)
Gneiss
Gneiss
Banded Slate (Lithified Mudstone)
Low-grade Metamorphosed Mudstone / Slate
Gneiss
Gneiss
Mica Schist
Mica Schist
Banded Gneiss
Gneiss
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)
Gneiss (complex silicate composition)
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Manhattan Schist
Manhattan Schist (Aluminous Metasedimentary Rock)
Quartzite
Quartzite (SiO2)
Banded Quartzite
Quartzite (SiO2 with impurities)
White Marble
Calcite-rich Metasomatized Carbonate (CaCO3)
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
Anthracite Coal
Anthracite (Carbon-based sedimentary rock typically classified as metamorphic)
Quartzite Pebble
Meta-quartzite
Quartzite Pebble
Quartzite (SiO2)
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
Mica Schist (with Golden/Biotite inclusions)
K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)
Marble
Recrystallized Carbonate Rock (CaCO3)
Quartzite
Quartzite (chiefly SiO2)
Quartzite Pebble
Metamorphic Quartz-rich Rock (SiO2)
Gneiss
Gneiss (High-grade Metamorphic Rock)
Granitic Gneiss
Gneiss (High-grade Metamorphic Rock)
Quartzite River Pebble
Quartzite (principally SiO2)
Quartzite river stone
Quartzite (SiO2)
Gneiss
Gneiss
Greenschist
Greenschist (Chlorite-Epidote-Actinolite Schist)
Quartzite River Cobble
Quartzite (SiO2)
Quartzite
Quartzite (primarily SiO2)
Gneiss
Gneiss
Anthracite Coal
High-rank coal (primarily Carbon, C)