Quartzite
Metamorphic rock composed primarily of quartz (SiO2)
metamorphic
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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Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Quartzite
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Sandstone
Arenite (mostly Quartz-based)
sedimentary
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Quartzite
Quartzite (composed primarily of silica, SiO2)
metamorphic
Unakite
Granitic Unakite (Alteration rock composed of pink orthoclase feldspar, green epidote, and clear quartz)
metamorphic
Greenstone / Greenschist
Greenschist (composed of chlorite, epidote, and actinolite)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Blue Apatite
Ca5(PO4)3(F,Cl,OH)
mineral
Banded Quartzite or Gneissic Pebble
Quartzite with mafic inclusions (SiO2) or Banded Gneiss
metamorphic
Siltstone
Siltstone (primarily composed of quartz and clay minerals)
sedimentary
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
sedimentary
Shale
Fissile mudrock (composed primarily of clay minerals and quartz)
sedimentary
Fulgurite
Fulgurite (Lechatelierite), amorphous SiO2
metamorphic
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Quartzite (Yellow/Tan)
Metamorphic Rock composed of Quartz (SiO₂)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock typically composed of Quartz, Feldspar, and Biotite/Amphiboles)
metamorphic
Serpentinite (Serpentine Rock)
Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.
Metamorphic
Quartzite
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Granite (Weathered)
Phaneritic Felsic Igneous Rock
Igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Mammoth or Mastodon Tooth Fragment
Mammuthus / Mammut molar fragment
fossil
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe)3Si2O5(OH)4)
metamorphic
Quartzite
Metamorphic Rock (composed primarily of Quartz, SiO2)
metamorphic
Greenstone / Greenschist
Greenschist (composed primarily of Chlorite, Epidote, and Actinolite)
metamorphic
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Serpentinite
Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)
metamorphic
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Weathered gneiss
Banded gneiss, commonly composed of quartz, feldspar, and mica
metamorphic
Schist
Mica Schist
metamorphic
Greenschist
Greenschist (composed mainly of actinolite/tremolite, chlorite, and epidote)
metamorphic
Quartzite (River Pebble)
Quartzite (composed primarily of Silica, SiO2)
metamorphic
Granite
Felsic intrusive igneous rock
igneous