Granite
Granite (Felsic Plutonic Rock)
Igneous
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Amphibolite (likely)
Amphibolite, composed mainly of hornblende-group amphibole and plagioclase feldspar
metamorphic
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous
Red Sandstone
Clastic sedimentary rock (primarily Quartz with Hematite)
sedimentary
Dalmatian Stone
Dalmatian Stone (formerly called Dalmatian Jasper)
igneous
Likely milky quartz, possibly quartz-rich vein rock
Quartz (SiO₂); identification from the image is uncertain
mineral
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Banded Gneiss
Gneiss
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica)
metamorphic
Bauxite (Pisolitic Bauxite)
Bauxite (mixture of Hydrous Aluminum Oxides)
sedimentary
Banded gneiss pebble
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Weathered granite
Granite, a quartz–feldspar–mica intrusive igneous rock
igneous
Dalmatian Stone
Dalmatian Stone (Felsic Igneous Rock)
igneous
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granite fragment
Granite (Felsic intrusive igneous rock)
igneous
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Quartzite
Metamorphic rock composed primarily of quartz (SiO2)
metamorphic
Greenstone
Metabasalt (composed mainly of chlorite, epidote, and actinolite)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Greenstone pebble (identification uncertain from photo)
Greenstone, typically metamorphosed mafic rock composed of chlorite, actinolite, and epidote
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, e.g., Antigorite, Lizardite, or Chrysotile)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Peridotite
Ultramafic igneous rock
igneous
Banded gneiss
Gneiss, composed mainly of quartz, feldspar, and mica
metamorphic
Siltstone
Siltstone (primarily composed of SiO2)
sedimentary
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Mica/Amphibole)
metamorphic
Sandstone (Iron-stained)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
sedimentary
Gray Slate Pebble
Slate (metamorphosed mudstone/shale)
metamorphic
Likely serpentinite (green serpentine rock)
Serpentinite, composed chiefly of serpentine-group minerals (antigorite, lizardite, and/or chrysotile)
metamorphic
Dalmatian Jasper
Dalmatian Stone (Felsite with Arfvedsonite/Tourmaline)
igneous
Banded Rock (likely Quartz-rich)
Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals
Mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Sandstone (likely Arkosic or Lithic Sandstone)
Clastic Sedimentary Rock (SiO2 with assorted minerals)
sedimentary
Granite Pebble
Intrusive Igneous Rock
igneous
Granite
Phaneritic intrusive igneous rock (approx. 70 percent SiO2)
igneous
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Conglomerate
Conglomerate (Sedimentary Rock)
sedimentary
River Siltstone Pebble
Siltstone (primarily composed of silica and clay minerals)
sedimentary