Gneiss (Metamorphic Rock)
Gneiss
Category
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Gneiss (Metamorphic Rock)
Gneiss
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
Quartzite Pebble
Metamorphic rock primarily composed of Silicon Dioxide (SiO2)
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone
Sandstone (clastic sedimentary rock)
Granite
Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)
Gneiss
Metamorphic Gneiss
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
Greenish Metamorphic Rock (likely containing epidote or chlorite)
Metamorphic rock, possibly epidosite or greenstone
Chert / River Pebble
Microcrystalline Silica (SiO2)
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
Granite
Phaneritic Plutonic Igneous Rock (primarily composed of quartz, alkali feldspar, and plagioclase)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
Sandstone
Arenite
Greenstone / Greenschist
Greenschist facies metamorphic rock
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
Sandstone (Iron-stained)
Arenite (primarily Quartz, SiO2)
Clear Quartz Crystal
Silicon Dioxide (SiO2)
Gneiss
Gneiss (High-grade regional metamorphic rock)
Basalt
Basalt (primarily composed of Plagioclase Feldspar and Pyroxene)
Quartzite
Quartzite (composed primarily of silica, SiO2)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)₈[(S,Cl,SO₄,OH)₂|(Al₆Si₆O₂₄)], with varying amounts of Calcite, Pyrite, and Sodalite.)
Gneiss
Foliated Metamorphic Rock
Granite Gneiss
Gneiss (high-grade metamorphic rock)
Banded Gneiss
Gneiss (Metamorphic Rock)
Gneiss
Gneissic Metamorphic Rock
Gneiss
Gneiss (Metamorphic Rock)
Garnet Schist
Almandine Garnet-bearing Mica Schist
Serpentine
Serpentinite (composed primarily of Mg3Si2O5(OH)4)
Vesicular Basalt (commonly mistaken for Slag)
Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
Granite
Granite
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
Sandstone
Arenite (primarily SiO2)
Granite
Plutonic Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
Schist
Mica Schist (contains muscovite/biotite and quartz)