Serpentine (Serpentinite)
Serpentinite (composed largely of serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Category
Metamorphic Rock (Composed Of Multiple Minerals)
Browse metamorphic rock (composed of multiple minerals) specimens identified by the Rock Identifier community.
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Hag Stone
Perforated Flint or Chert (SiO2)
sedimentary
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Quartzite Cobble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartzite Cobble
Quartzite (primarily SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
metamorphic
Quartzite pebble
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Peridotite
Ultramafic igneous rock
igneous
Marble
Metamorphosed Limestone
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granite
Phaneritic plutonic rock (SiO2-rich)
igneous
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Breccia
Polymictic volcanic breccia (likely basaltic-andesitic matrix)
igneous
Likely gneiss
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Clear calcite cleavage fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Banded stromatolite (probable fossil limestone)
Microbial carbonate; commonly composed chiefly of calcite (CaCO₃), often classified as stromatolitic limestone
fossil
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Biotite schist
Mica schist, composed mainly of biotite mica and quartz with feldspar and iron oxides
metamorphic
Nephrite Jade
Nephrite
Mineral/Rock
Epidosite
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Green Schist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Quartzite pebble
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Ferruginous Sandstone
Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Likely hornblende-rich amphibolite
Amphibolite, composed chiefly of hornblende (amphibole) and plagioclase feldspar
metamorphic
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Phyllite (possibly low-grade greenish slate)
Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula
metamorphic
Dalmation Jasper (or Dalmation Stone)
Dalmation Stone (composed of Perthite, Quartz, and Arfvedsonite)
igneous
Serpentinite
Serpentinite (composed largely of Serpentine minerals such as Lizardite, Antigorite, and Chrysotile: Mg3Si2O5(OH)4)
metamorphic
Pink-and-black gneiss
Foliated granitic gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)