River Stone (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
Learn about Metamorphic (Likely Gneiss Or Schist Based On Texture) in the encyclopedia
View all →
Sandstone
Arenite (SiO2 based)
sedimentary
Garnetiferous Quartzite (Garnet Gneiss Pebble)
Garnet-bearing Quartzite or Quartz-Feldspar Gneiss
metamorphic
River Stone (likely Basalt or Diabase)
Mafic Igneous Rock (likely Basalt)
igneous
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Granitic Gneiss
Gneiss (Complex silicate composition)
metamorphic
River Pebble (Likely Quartzite or Gneiss)
Metamorphosed Silicate Rock (primarily SiO2)
metamorphic
Fuchsite
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Soapstone and Jade
Steatite (Mg3Si4O10(OH)2) and Nephrite/Jadeite
metamorphic
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Dark gray metamorphic rock, likely hornfels or fine-grained amphibolite
Hornfels/amphibolite; commonly quartz, feldspar, amphibole, biotite, and minor sulfides
metamorphic
Red granite or granitic gneiss pebble
Felsic granitoid, likely quartz–feldspar–biotite granite; possible weakly gneissic texture
igneous
Sandstone
Arenite (SiO2 based)
sedimentary
Quartz Pebble with Host Rock / Schist Matrix
Silicon Dioxide (SiO2) with Metamorphic Host Rock
sedimentary
Weathered limestone or calcareous sandstone
Calcite-rich carbonate rock, chiefly calcium carbonate (CaCO₃), possibly fossiliferous limestone
sedimentary
Sandstone (lithic/arkosic)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz
Quartz (SiO₂)
Mineral
Graphite
Graphite (Native Carbon, C)
metamorphic
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium impurities
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Schist
Mica Schist
metamorphic
Greenschist (Greenstone)
Chlorite schist (primarily Chlorite-Epidote-Actinolite-Albite)
metamorphic
Gneiss (specifically Epidote-Quartz Gneiss)
Gneiss containing Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)) and Quartz (SiO2)
metamorphic
Granite Gneiss
Gneiss (quartz-feldspar dominated)
metamorphic
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Sandstone (with potential iron-oxide weathering)
Arenite (SiO2 based)
sedimentary
Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (likely Ferruginous)
Sandstone (SiO2 with iron oxides)
sedimentary
Weathered granite or granitic gneiss
Granite: quartz, feldspar, and mica; possibly gneiss if the dark minerals are banded
igneous
Ruby (Cabochon)
Corundum (Al2O3)
gemstone
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Tourmaline (Mixed colors)
Boron silicate mineral (Na,Ca)(Li,Mg,Al,Fe,Mn,Ti,V,Cr)3Al6(BO3)3Si6O18(OH,F)4
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Tourmaline (Multi-colored)
Complex Borosilicate (Na,Ca)(Li,Mg,Al,Fe)3Al6(BO3)3Si6O18(OH)4
mineral
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic