Sandstone
Arenite (composed primarily of SiO2)
sedimentary
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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Sandstone (Weathered Coastal Boulder)
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Micaceous)
Arenite (composed primarily of SiO2)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Granite
Granite (composed of Quartz, Feldspar, and Mica)
igneous
Weathered, iron-stained quartz-rich rock (possibly quartzite)
Likely quartzite, composed mainly of quartz (SiO₂); identification is provisional from the image
metamorphic
Rounded quartz-veined pebble
Likely quartz-veined metamorphic rock; exact host rock is indeterminate from the image
metamorphic
Diabase (Trap Rock)
Diabase (also known as Dolerite)
igneous
Gravel and Pebbles
Unconsolidated rock fragments / detrital sediment
sedimentary
Basalt with Iron Oxidation
Aphanitic Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Layered metamorphic rock, possibly banded gneiss
Gneiss (tentative; exact identification requires closer examination)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Basalt River Pebble
Extrusive mafic igneous rock; primarily composed of Plagioclase Feldspar and Pyroxene
Igneous
Granite with Pyrite or Mica
Phaneritic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Marble
Metamorphic Rock (composed primarily of recrystallized calcite, CaCO3, or dolomite)
metamorphic
Granite
Felsic intrusive igneous rock
igneous
Pink Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone
Arenite
sedimentary
Sandstone
Arenite
sedimentary
Mica-rich schist
Quartz–muscovite/biotite schist
metamorphic
Sandstone (Graywacke)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of lazurite, calcite, and pyrite)
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartz-rich river pebble, possibly quartzite
Quartz (SiO₂); possibly quartzite, a rock composed predominantly of recrystallized quartz
metamorphic
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Likely dark green-gray metamorphic pebble
Indeterminate; possibly chlorite schist, serpentinite, or amphibolite
metamorphic
Quartz cluster, possibly druzy quartz on matrix
Quartz (SiO₂), likely microcrystalline to coarse crystalline; associated matrix uncertain
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Serpentinite
Serpentinite (composed largely of serpentine minerals like antigorite, lizardite, or chrysotile)
metamorphic
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Shark Tooth Fossil
Carcharocles megalodon or similar extinct shark tooth
fossil
Sandstone
Sandstone (composed primarily of sand-sized minerals or rock grains)
sedimentary
Banded quartz-rich metamorphic rock (likely quartzite or quartz-mica schist)
Quartzite/schist composed chiefly of SiO₂ quartz with mica, feldspar, and iron-oxide or copper-colored accessory minerals
metamorphic
Dark, iron-stained rock; exact identification uncertain
Possibly a fine-grained mafic igneous rock (basalt or diabase); image alone is insufficient for a reliable species-level identification
igneous
Slate
Slate; fine-grained metamorphic rock composed mainly of clay minerals, mica, and quartz
metamorphic
Gneiss (with Quartzite layers)
Gneissic Metamorphic Rock
metamorphic