Quartz (Rock Crystal) with minor impurities
Quartz (SiO2)
Mineral
Category
Mineral And Metamorphic Rock
Browse mineral and metamorphic rock specimens identified by the Rock Identifier community.
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Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
Gneiss
Gneiss
metamorphic
White Jade (Nephrite)
Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Unakite
Epidotized Granite
metamorphic
Lapis Lazuli
Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
metamorphic
Banded Gneiss
Foliated Gneiss
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite/Biotite)
metamorphic
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Charoite
Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)
metamorphic
Rounded greenstone pebble
Likely serpentinite or chlorite-rich metamorphic rock; exact identification requires testing
metamorphic
Green Greenstone / Celadonite-bearing Metamorphic Rock
Greenschist / Celadonite / Serpentinitic pebble
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine-group minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz variety) with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Yellow Apatite Sphere (Polished)
Fluorapatite / Ca5(PO4)3F
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral
Citrine Geode Fragment
Citrine (Silicon Dioxide with Iron Impurities), SiO2
mineral
Eclogite
Eclogite (Omphacite-Garnet Metamorphic Rock)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Quartz-rich breccia or vein quartz fragment
Quartz (SiO₂), likely with iron-oxide staining and attached host rock
mineral
Wishing Stone with Quartz Vein
Hydrothermal Quartz Vein in Metasedimentary Matrix (primarily SiO2)
metamorphic
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2) with iron impurities
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Quartz/Schist
gemstone
Unakite
Epidotized Granite
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Likely slate fragment
Slate; fine-grained foliated metamorphic rock, commonly quartz–mica–chlorite rich
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Greenstone / Greenschist
Metamorphosed mafic igneous rock (Greenschist facies)
metamorphic
Specular Hematite
Iron(III) oxide (Fe2O3)
mineral
Granite Gneiss
Gneiss (Polymetamorphic Quartz-Feldspar-Mica rock)
metamorphic
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
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
River Cobble (Gneiss/Migmatite)
Gneissic Metamorphic Rock (composed mainly of Quartz, Feldspar, and Biotite)
metamorphic
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
Mineral
Serpentine
Antigorite, Lizardite, or Chrysotile; (Mg, Fe)3Si2O5(OH)4
metamorphic
Unakite
Epidotized Granite
metamorphic
Greenstone (Celadonite-bearing Volcanic)
Hydrothermally altered basalt or andesite with Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
metamorphic
Polished basalt (likely vesicular basalt)
Basalt; predominantly plagioclase, clinopyroxene, and commonly olivine or iron-titanium oxides
igneous
Granite cobble
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous