Schist
Mica Schist
metamorphic
Category
Metamorphic
Browse metamorphic specimens identified by the Rock Identifier community.
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Quartzite
Quartzite (SiO2)
metamorphic
Banded Gneiss (with possible weathered sulfide or iron staining)
Gneiss, potentially with iron oxide/hydroxide staining (e.g., limonite) or weathered sulfides
Metamorphic
Garnet (Red Garnet)
Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).
Mineral (specifically, a variety of the mineral species Pyrope-Almandine Garnet)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz / Quartzite
Quartz (Silicon Dioxide, SiO2)
metamorphic
Schist
Mica Schist
metamorphic
Quartzite with Iron Inclusions
Metamorphosed Sandstone (SiO2 dominated)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals like Antigorite, Lizardite, or Chrysotile)
metamorphic
Tiger's Eye
SiO2 (Quartz with inclusions of altered crocidolite)
metamorphic
Nuummite
Nuummite (Ortho-amphibole rock, primarily Anthophyllite and Gedrite)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with Fuchsite inclusions
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4
metamorphic
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
sedimentary
Granite (with Almandine Garnet inclusions)
Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)
igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Lapis Lazuli
Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Tiger's Eye (Raw)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
River Cobble (likely Metasedimentary)
Metasedimentary Rock / Quartz-rich Sandstone
metamorphic
Muscovite Schist
Muscovite Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
White Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Unakite (Epidosized Granite)
Unakite (composed of Epidote, Orthoclase, and Quartz)
metamorphic
Quartzite with Calcite Tufa
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)
metamorphic
Hawk's Eye / Pietersite (Tiger's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
Green Quartzite Pebble
Quartzite (SiO2 with chlorite/fuchsite inclusions)
metamorphic
Serpentine
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe)3Si2O5(OH)4
metamorphic
Green Quartzite
Quartzite with Fuchsite or Chlorite inclusions
metamorphic
Pink Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite Cobble
Quartzite
metamorphic