Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Category
Mineral And Metamorphic Rock
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Serpentine pendant
Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄
metamorphic
Unakite
Altered granite (Epidote, Orthoclase Feldspar, and Quartz)
metamorphic
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (primarily Muscovite and Biotite composition)
metamorphic
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Almandine Garnet in Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
metamorphic
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Green Serpentine
Serpentine group (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
mineral
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral
Garnet Gneiss
Gneiss containing almandine-pyrope garnet
metamorphic
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Serpentinite
Serpentinite (Hydrated magnesium iron silicate)
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Gneiss
Gneiss
metamorphic
Possible weathered mica-rich metamorphic fragment
Mica schist or phyllite (quartz–mica assemblage; identification uncertain from image)
metamorphic
Granite Gneiss
Gneiss (containing quartz, alkali feldspar, plagioclase, biotite/amphibole)
metamorphic
Banded gneiss
Gneiss; typically quartz–feldspar–mica assemblage
metamorphic
Quartz (Raw Crystal)
Silicon Dioxide (SiO2)
mineral
Fuchsite in Quartz
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Quartz (SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Banded gneiss
Gneiss, chiefly quartz–feldspar–mica (variable composition)
metamorphic
Mica Schist
Schist (Biotite/Muscovite dominant)
metamorphic
Weathered brown mineralized rock
Likely iron-stained quartzite or quartz-rich metamorphic rock; exact identification requires testing
metamorphic
Grey Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Marble
Recrystallized Carbonate Rock (CaCO3)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
metamorphic
Mica schist, likely biotite–muscovite schist
Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Altered Host Rock
mineral
Greenschist
Greenschist facies metamorphic rock
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
mineral
Serpentine
Antigorite, Lizardite, and Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Lapis Lazuli
Na8(Al6Si6O24)S2 (Lazurite is the primary constituent mineral)
metamorphic
Unakite
Altered Granite (Orthoclase + Epidote + Quartz)
metamorphic