Quartz vein fragment
Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions
mineral
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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Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Weathered River Rock (likely Chert or Basalt with algae)
Silicon dioxide (SiO2) with organic biofilm
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Dalmatian Stone (commonly Dyed)
Dalmatian Jasper (Peralkaline igneous rock)
igneous
Sandstone (Quartzose)
Arenite (Siliciclastic sedimentary rock)
sedimentary
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Serpentine (Serpentinite)
Serpentinite (composed largely of serpentine group minerals: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Sandstone
Arenite (primarily SiO2 with various cementing agents)
sedimentary
Botryoidal Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Sandstone (Ferruginous)
Arenite (Fe2O3 stained)
sedimentary
Schist
Mica Schist
metamorphic
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite with Quartz)
metamorphic
Polished metallic sulfide-bearing pebble
Likely pyrite-bearing slate, schist, or sulfide-rich ore; exact identification requires testing
mineral
Gneiss
Gneissic Metamorphic Rock (Mineral composition: Quartz, Feldspar, Amphibole/Biotite)
metamorphic
Unakite
Altered Granite (Epidote, Orthoclase Feldspar, Quartz)
metamorphic
Marble
Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).
Metamorphic Rock
Sandstone (with Iron Staining)
Arenite (Siliclastic sedimentary rock)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Bauxite
Alumina ore (Mixture of Gibbsite, Boehmite, and Diaspore)
sedimentary
Sandstone (Quartzose)
Sandstone (composed primarily of Quartz: SiO2)
sedimentary
Bauxite
Hydrated aluminum oxides (mixture of gibbsite, boehmite, and diaspore)
sedimentary
Bauxite
Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)
sedimentary
Bauxite
Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Slate
Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)
metamorphic
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Schist
Mica Schist (Medium-grade metamorphic rock)
metamorphic
Likely gneiss
Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole
metamorphic
Banded Gneiss with Quartz Vein
Foliated Metamorphic Rock (Gneiss)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Clear calcite cleavage fragment
Calcite (calcium carbonate, CaCO₃)
mineral
Quartz with Mica and Feldspar
Granitic Pegmatite Fragment (SiO2 + KAlSi3O8 + KAl2(AlSi3O10)(OH)2)
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous