Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Gneiss
Gneiss
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Unknown Rock Fragment
Unknown
unknown
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Gneiss (specifically a Granitic Gneiss)
Gneiss (Composition: Quartz, Feldspar, Mica)
metamorphic
Unakite
Epidotized Granite
metamorphic
Dark mafic rock, likely basalt
Basalt (fine-grained assemblage chiefly plagioclase and pyroxene, commonly with olivine and iron oxides)
igneous
Probable serpentinite (serpentine-rich rock)
Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with possible magnetite and olivine remnants
metamorphic
Dark rounded pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and olivine)
igneous
Gold-bearing Quartz / Auriferous River Rock
Lode Gold in Quartz Matrix (SiO2 + Au)
sedimentary
Gneiss
Gneiss (Metamorphic rock composed primarily of quartz, feldspar, and mica)
metamorphic
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Blue Sapphire
Corundum (Al2O3)
mineral
Blue Quartzite (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebbeckite
metamorphic
Limonite
FeO(OH)·nH2O
mineral
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Quartzite
Quartzite
Metamorphic
Quartzite
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Quartz Vein in Host Rock (Gabbro or Basalt)
Silicon Dioxide (SiO2) with Mafic Silicates
metamorphic/igneous
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Quartzite
Quartzite (SiO2)
metamorphic
Serpentine Jade (New Jade/Olive Jade)
Serpentinite (a rock composed primarily of serpentine minerals) / Mg3Si2O5(OH)4 for Antigorite and Lizardite
Mineral
Milky quartz vein rock
Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals
mineral
Quartzite with Iron Inclusions
Quartzite (SiO2 with Fe2O3 impurities)
metamorphic
Milky Quartz (Crystal Cluster)
Silicon Dioxide (SiO2) - Quartz Variety
mineral
Quartz with Iron Stains
Quartz (SiO2) with iron oxide/hydroxide staining
Mineral
Greenstone / Metagraywacke
Metamorphosed basaltic or sedimentary rock (Complex Silicate)
metamorphic
Quartzite Pebble (River Siltstone/Quartzite)
Quartzite (SiO2 composition)
metamorphic
Quartz vein in weathered host rock
Milky quartz (SiO₂), likely in a granitic or metamorphic matrix
mineral
Quartzite with Iron Hydroxide Staining
Quartzite (primarily SiO2) with Limonite/Goethite staining
metamorphic
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly quartz (SiO₂), with minor iron-oxide and mica impurities
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Slate
Slate (Foliated Metamorphic Rock)
metamorphic
Unakite / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Serpentine
Serpentinite (group of minerals including Antigorite, Lizardite, or Chrysotile) (Mg, Fe)3Si2O5(OH)4
metamorphic
Epidote in Quartz
Quartz with Epidote inclusions (SiO2 with Ca2(Al,Fe)3(SiO4)3(OH) inclusions)
Mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral