Quartz (likely tumbled or naturally water-worn)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Weathered greenstone (likely serpentinite or altered basalt)
Serpentinite-group rock, commonly dominated by serpentine minerals (antigorite/lizardite); exact identification requires testing
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
gemstone
Quartz-rich pegmatite (likely granite/pegmatite boulder)
Coarse-grained felsic igneous rock, chiefly quartz (SiO₂), feldspar, and minor mica; exact identification requires testing
igneous
Quartz crystal fragment in weathered host rock
Quartz (SiO₂), possibly in a feldspathic or iron-stained matrix
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Complex rock composed mainly of lazurite, calcite, and pyrite
gemstone
Dark mafic rock, likely basalt
Basalt; chiefly plagioclase feldspar, clinopyroxene, and commonly olivine or iron oxides
igneous
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Pink Quartzite
Quartzite (SiO2 with minor iron oxide impurities)
metamorphic
Likely weathered brown quartz-bearing rock
Tentatively weathered granite or granitic gneiss; exact identification is uncertain from the photograph
igneous
Mica-rich metamorphic rock, likely schist
Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar
metamorphic
Pyrite in Quartz
Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)
mineral
Quartz Vein in Gneiss or Schist
Metamorphic rock with SiO2 vein
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic quartz rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Schist
Crystalline Metamorphic Rock (Schist)
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Quartzite Pebble
Metamorphic Quartz-rich Rock
metamorphic
Slate
Foliated metamorphic rock (Slate)
metamorphic
Yellow Quartzite
Metamorphic Rock (Mainly SiO2)
metamorphic
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock
metamorphic
Slate
Low-grade Metamorphic Rock
metamorphic
Quartzite with Quartz Veining
Metamorphic Quartz Rock (SiO2)
metamorphic
Lapis Lazuli (Fragment)
Lazurite-rich metamorphic rock
metamorphic
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Mica Schist
Schist (Muscovite-Biotite Schist)
metamorphic
Gneiss
Gneiss
metamorphic
Magnetite
Magnetite (Fe3O4)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral