Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Igneous Or Sedimentary
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Banded gneiss pebble
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Gneiss (Banded Gneiss)
Gneiss
metamorphic
Banded metamorphic rock, likely gneiss
Gneiss; predominantly quartz–feldspar with mica/amphibole minerals
metamorphic
Red Agate
Chalcedony (SiO2)
gemstone
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Auriferous Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Yellow Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Gneiss (Pebble)
Gneiss
metamorphic
Banded metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss, possibly migmatitic
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic
Banded gneiss (likely amphibolite-bearing gneiss)
Gneiss; quartz–feldspar–mica/amphibole aggregate
metamorphic
Gneiss with Quartz/Feldspar Vein
Quartz-Feldspathic Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Dark gneiss or amphibolite cobble
Banded metamorphic rock, likely quartz–feldspar–biotite gneiss or amphibolite
metamorphic
Foliated metamorphic rock, likely gneiss with amphibolite or chlorite-rich bands
Biotite–quartz–feldspar gneiss, locally mafic amphibolite; mineral composition is uncertain from the photograph
metamorphic
Gneiss
High-grade foliated metamorphic rock
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Tumbled banded gneiss or amphibolite
Banded metamorphic rock, likely quartz–feldspar–biotite gneiss with amphibole
metamorphic
Banded Gneiss
Banded Orthogneiss or Paragneiss (Quartz-Feldspathic Gneiss)
metamorphic
Gneissic River Pebble
Gneiss
metamorphic
Gneiss (Metamorphic Rock)
Gneiss
metamorphic
Banded gneiss
Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss
metamorphic
Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone
Undetermined; likely iron oxides/hydroxides (goethite–hematite–limonite) in a silicate host
mineral
Botryoidal Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Clear Quartz Geode
Crystalline Silicon Dioxide (SiO2)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–mica assemblage
metamorphic
Quartz–feldspar–mica metamorphic rock, likely gneiss
Gneiss; composition commonly quartz (SiO₂), feldspars, biotite/hornblende, and minor accessory minerals
metamorphic
Gneiss with Orthoclase Feldspar
Gneissic Metamorphic Rock with K-Feldspar inclusions
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss
metamorphic
Ruby Zoisite
Anyolite (Ca2Al3(SiO4)3(OH) + Al2O3:Cr)
metamorphic