Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Iron-Stained Quartzite
Recrystallized Meta-Quartzite (primarily SiO2)
Shungite
Non-crystalline carbon (high-carbon metamorphic rock)
Almandine Garnet
Iron aluminum silicate - Fe3Al2(SiO4)3
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
Gneiss
Gneiss
Kyanite in Quartz
Kyanite (Al2SiO5) with Quartz (SiO2)
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
Gneiss
Gneiss
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
Arsenopyrite with Schist Matrix
Arsenopyrite (FeAsS)
Biotite Schist
Biotite Mica Schist [K(Mg,Fe)3AlSi3O10(OH,F)2]
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
Garnet (likely Almandine)
Almandine Garnet, Fe3Al2(SiO4)3
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2
Pyrite
Iron Disulfide (FeS2)
Garnet-bearing Schist
Almandine Garnet (Fe3Al2(SiO4)3) in Mica Schist
Raw Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
Sand Grain (Silica/Quartz Grain)
Silicon Dioxide (SiO2)
Jasper
Silicon Dioxide (SiO2)
Gneiss with Quartz/Feldspar Vein
Quartz-Feldspathic Gneiss
Banded Gneiss
Gneiss (Metamorphic Rock)
Anthracite Coal
Anthracite (Carbon-rich metamorphic sedimentary rock)
Magnetite
Magnetite (Fe3O4)
Garnet in Schist
Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)
Quartzite
Quartzite (SiO2)
Biotite Schist
Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
Green Aventurine
Silicon Dioxide (Quartz) with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
Gneiss (Green Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
Marble
Recrystallized Calcite (CaCO3)
Gneiss (Granitic Gneiss)
Gneiss
Quartzite
Quartzite (primarily SiO2)
Slate
Foliated Metamorphic Rock (primarily composed of quartz, illite, and chlorite)
Schist with Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
Banded Marble
Recrystallized Calcite (CaCO3)
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
Biotite Gneiss
Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)
Gneiss (Granitic Gneiss)
Gneiss
Garnet in Quartz Matrix
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz (SiO2)
Banded Gneiss
Gneiss (Metamorphic Rock)
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2