Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Serpentinite
Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)
metamorphic
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Sandstone
Sedimentary Rock (Quartz arenite/Arkose)
sedimentary
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Marble
Marble (metamorphosed limestone or dolostone), primarily composed of calcite (CaCO3) or dolomite (CaMg(CO3)2)
metamorphic
Sandstone
Arenite
sedimentary
River Pebble (Greywacke / Basalt Pebble)
Indeterminate Rounded Pebble (composed of quartz, feldspar, or mafic minerals)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
sedimentary
Quartz (pebble)
Quartz (SiO₂)
Mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite with Mafic Inclusions
Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)
igneous
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Sandstone (specifically Flagstone)
Arenite (primarily composed of SiO2)
sedimentary
Granite (Dioritic variant)
Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Sandstone
Arenite (primarily SiO2)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Gneiss
Foliated Metamorphic Rock
metamorphic
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Granitic Gneiss
Gneiss (high-grade metamorphic rock)
metamorphic
Red jasper
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
mineral
Bauxite
Bauxite (Al2O3·2H2O)
sedimentary
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Sandstone (with carbonaceous plant fragments)
Arenite (composed primarily of SiO2)
sedimentary
Dark green metamorphic rock, likely serpentinite
Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Mica Schist
Mica Schist (primarily composed of Muscovite, Biotite, and Quartz)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Greenstone with Epidote or Quartz Vein
Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (Flagstone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (with prominent jointing/fractures)
Arenite (composed primarily of SiO2)
sedimentary
Biotite Schist
Schist (Biotite-dominated)
metamorphic
Lazulite Quartzite
Quartzite with Lazulite (SiO2 with (Mg,Fe)Al2(PO4)2(OH)2)
metamorphic