Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Composed Of Multiple Minerals) in the encyclopedia
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Oolitic Limestone
Oolite (Sedimentary rock composed of CaCO3)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Schist
Schist (metamorphic rock)
metamorphic
Sandstone
Sedimentary rock composed mainly of sand-sized minerals or rock grains
sedimentary
Gneiss
Gneiss
metamorphic
Ironstone
Ferruginous Sedimentary Rock (composed of Goethite, Hematite, and Limonite)
sedimentary
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
metamorphic
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Sandstone
Arenite
sedimentary
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides
mineral
Sandstone
Clastic Sedimentary Rock
sedimentary
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Sandstone
Clastic Sedimentary Rock
sedimentary
Greenstone / serpentine-rich metamorphic rock
Likely serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), with possible magnetite and chlorite
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock of granitic composition)
metamorphic
Vein-bearing sandstone or quartzite cobble
Quartz-rich sandstone with white quartz veins; possibly metamorphosed to quartzite
sedimentary
Granite Pebbles
Granite (composed primarily of Quartz SiO2, Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8), and Mica)
igneous
Soapstone
Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)
metamorphic
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Sandstone
Sedimentary Rock (Quartz/Feldspar grains cemented together)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Gneiss
Gneiss
metamorphic
Ironstone / Hematite
Iron(III) oxide (Fe2O3)
mineral
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Sandstone (River Rock)
Arenite (composed primarily of SiO2)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Schist (Oxidized)
Mica Schist with Iron Oxide staining
metamorphic
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Biotite–quartz–feldspar gneiss
Gneiss, composed chiefly of quartz (SiO₂), feldspar, and dark mica, likely biotite
metamorphic
Granite / Quartzite Specimen
Granite / Quartz (SiO2 with Feldspar and Mica)
igneous
Quartzite with Epidote/Chlorite Inclusion
Metamorphic Quartzite (SiO2 with accessory silicate minerals)
metamorphic
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite, composed predominantly of quartz (SiO₂), with dark biotite, amphibole, or iron-oxide inclusions
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Botryoidal Chalcedony Geode
Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz
mineral