Basalt
Mafic Igneous Rock (composed primarily of plagioclase, pyroxene, and olivine)
igneous
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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Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Quartzite Pebble
Metamorphic rock primarily composed of Silicon Dioxide (SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Vesicular basalt (probable scoriaceous basalt)
Basalt, composed mainly of plagioclase feldspar, pyroxene, and commonly olivine
igneous
Weathered fossiliferous limestone fragment, possibly fossil coral or shell material
Indeterminate carbonate fossil in calcitic limestone; likely composed mainly of calcite (CaCO₃), but species identification is not possible from this image alone
fossil
Quartzite
Quartzite, composed predominantly of recrystallized quartz (SiO₂)
metamorphic
Green Slate or Metamorphic Rock with Moss/Lichen
Metamorphic rock / Phyllite or Slate variant
metamorphic
Granite
Intrusive Igneous Rock
igneous
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Slate
Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)
metamorphic
Sandstone Pebble
Sandstone (Quartzose/Feldspathic Sandstone)
sedimentary
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Weathered, quartz-rich metamorphic rock (likely schist or gneiss)
Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining
metamorphic
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Lapis Lazuli
Na8(Al6Si6O24)S2 (composed primarily of Lazurite, Calcite, and Pyrite)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Mica Schist
Mica Schist (composed mainly of Muscovite / Biotite, Quartz, and Feldspar)
metamorphic
Basalt with Iron Oxidation
Extrusive Mafic Igneous Rock (composed of Plagioclase and Pyroxene)
igneous
Quartzite
Quartzite (composed primarily of Silicon Dioxide, SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Jasper (likely Polychrome or Ocean Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary
Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Sea Snail Shell (Top Shell)
Trochidae family (Calcium Carbonate, CaCO3)
mineral
Ferruginous Sandstone
Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)
sedimentary
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Sandstone (Weathered Pebble)
Sedimentary Rock (Quartz arenite)
sedimentary
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Basalt
Mafic Igneous Rock (composed primarily of Pyroxene and Plagioclase Feldspar)
igneous
Botryoidal Chalcedony / Agate
Silicon Dioxide (SiO2)
mineral
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Serpentinite
Serpentinite (composed largely of serpentine group minerals including Antigorite, Lizardite, and Chrysotile, (Mg,Fe)3Si2O5(OH)4)
metamorphic
Vesicular basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone (Quartz-rich)
Arenite
sedimentary
Granite Gneiss
Granitic Gneiss
Metamorphic
Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)
Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz-rich granitic pegmatite fragment
Pegmatite, composed mainly of quartz (SiO₂), feldspar, and mica
igneous