Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral In Metamorphic Rock
Browse mineral in metamorphic rock specimens identified by the Rock Identifier community.
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Biotite (Black Mica)
Biotite (K(Mg,Fe++)3AlSi3O10(OH,F)2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Likely garnet-bearing rock fragment
Garnet-bearing schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Tumbled Amethyst
Quartz (Silicon Dioxide, SiO2, colored by iron impurities)
mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Likely biotite-rich schist or gneiss
Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica
metamorphic
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Garnet Schist
Almandine Garnet in Schist (X3Al2(SiO4)3)
metamorphic
Iron-rich quartzite or ferruginous metamorphic rock
Quartzite, predominantly SiO₂, stained by iron oxides (hematite/goethite)
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Uncertain pale green-gray mineral/rock fragment
Possibly serpentine-bearing rock or greenstone; exact identification requires testing
mineral
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Muscovite Mica Schist
Metamorphic Rock (Muscovite-Biotite Schist)
metamorphic
Lapis Lazuli (Tumbled)
Lazurite-dominated contact metamorphic rock
metamorphic
Quartzite with Feldspar and Mica (Granitic Gneiss Pebble)
Metamorphic Rock / Quartzite / Granitic Gneiss
metamorphic
Gneiss Pebble
Gneiss (Metamorphic Foliated Rock)
metamorphic
Quartz (Milky / Clear Quartz Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz with impurities or Host Rock
SiO2 (Silicon Dioxide) with mixed silicates
mineral
Dark gneiss or amphibolite cobble
Banded metamorphic rock, likely quartz–feldspar–biotite gneiss or amphibolite
metamorphic
Unakite
Epidotized Granite
metamorphic
Granitic Gneiss Pebble
Gneiss (felsic metamorphic rock)
metamorphic
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Aquamarine
Beryl (Be3Al2Si6O18)
gemstone
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Small dark mineral/rock fragment
Indeterminate; possibly biotite-rich schist, graphite, or metallic sulfide
mineral
Feldspar (Plagioclase / Orthoclase)
KAlSi3O8 / CaAl2Si2O8 - NaAlSi3O8
mineral
Mica-rich metamorphic rock, likely mica schist
Muscovite–biotite schist, possibly with garnet and quartz
metamorphic
Blue-gray metamorphic rock, likely slate or phyllite
Fine-grained foliated metapelite; commonly mica- and chlorite-rich
metamorphic
Gneiss
Metamorphic Rock (Gneissic texture)
metamorphic
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic