Red Sandstone
Arenite (primarily Quartz SiO2 with Hematite Fe2O3 cement)
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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Granite
Granite (composed primarily of Quartz, Feldspar, and Mica/Amphibole)
igneous
Basalt
Basalt (primarily composed of Plagioclase Feldspar and Pyroxene)
igneous
Slate
Foliated Metamorphic Rock (composed mainly of clay minerals or micas)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Granite (River Cobble)
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granite Pebble
Granite (Phaneritic intrusive rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Intrusive Igneous Rock
igneous
Quartz with Mica / Chlorite Inclusion
Silicon Dioxide (SiO2) with Phyllosilicate minerals
metamorphic
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Banded Gneiss
Gneiss (high-grade metamorphic silicate rock)
metamorphic
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Soapstone
Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)
Metamorphic Rock
Eclogite
Eclogite (composed primarily of Omphacite and Pyrope Garnet)
metamorphic
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Sandstone (Iron-stained)
Arenite (primarily Quartz, SiO2)
sedimentary
Sandstone (Ferruginous)
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Marble
Metamorphic rock composed of Recrystallized Carbonate Minerals (chiefly CaCO3)
metamorphic
Bauxite
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Sandstone (Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Sandstone
SiO2 (predominantly quartz sand)
sedimentary
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
metamorphic
Slate
Metamorphic Rock (Fine-grained)
metamorphic
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Dalmatian Stone
Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock
igneous
Red Sandstone
Arenite (primarily Quartz and Iron Oxide)
sedimentary
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
metamorphic
Ironstone Concretion (Limonite/Goethite)
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Red Sandstone
Sandstone (principally Quartz with Iron Oxide coating)
sedimentary