Granite
Phaneritic plutonic rock (SiO2-rich)
Category
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Granite
Phaneritic plutonic rock (SiO2-rich)
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, chlorite, and micas)
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, Mg3Si2O5(OH)4)
Sandstone
Arenite (primarily SiO2)
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group: Chrysotile, Lizardite, and Antigorite)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite)
Sandstone (specifically Lithic or Quartz Arenite)
Arenite (composed primarily of SiO2)
Conglomerate (Greenstone/Pebble Conglomerate)
Polymictic Conglomerate
Banded gneiss pebble
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
Bauxite
AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)
Gabbro
Phaneritic Mafic Plutonic Rock
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
Lapis Lazuli
Lapis Lazuli (Metamorphic rock primarily composed of Lazurite, Calcite, and Pyrite)
Quartzite Cobble
Quartzite (composed primarily of SiO2)
Greenstone / Greenschist
Greenschist (composed of Chlorite, Epidote, Actinolite)
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
Red Sandstone
Clastic sedimentary rock (primarily Quartz with Hematite)
Unakite
Unakite; epidote–pink feldspar–quartz rock
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Weathered Sandstone or Siltstone
Sedimentary Rock
Diorite (Spotted or Dalmatian Stone effect)
Diorite (Intermediate Plutonic Rock)
Eclogite
Eclogite (composed primarily of Omphacite and Garnet)
Granite
Phaneritic Felsic Igneous Rock
Unakite
Altered Granite (Granitic Metamorphic Rock)
Quartzite
Quartzite (composed primarily of SiO2)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals such as Antigorite, Lizardite, and Chrysotile)
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
Sandstone
Arenite (composed primarily of SiO2)
Banded Gneiss
Gneiss
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, and Chrysotile)
Quartzite
Quartzite (composed primarily of SiO2)
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
Dalmatian Jasper
Dalmatian Stone (Felsite with Arfvedsonite/Tourmaline)
Granite
Intrusive Igneous Rock
Unakite
Unakite (Metasomatized Granite)
Septarian Nodule
Septaria (composed of Calcite, Aragonite, and Limestone)
Diorite
Intermediate Intrusive Igneous Rock
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
Chlorite-rich schist (probable greenschist)
Chlorite–quartz–mica schist; commonly derived from basalt or shale under greenschist-facies metamorphism
Peridotite
Ultramafic igneous rock