Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Category
Metamorphic Or Sedimentary Depending On Local Grade
Browse metamorphic or sedimentary depending on local grade specimens identified by the Rock Identifier community.
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Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Rough Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
mineral
Dark gray slate (possibly argillite or shale)
Slate, a low-grade metamorphic rock derived mainly from shale; composition commonly quartz, illite/muscovite, chlorite, and clay minerals
metamorphic
Gneiss (specifically Pink Gneiss)
Gneiss (high-grade regional metamorphic rock)
metamorphic
Weathered schist or phyllite
Mica schist/phyllite; quartz–mica-rich foliated metamorphic rock
metamorphic
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Gneiss
Gneiss
metamorphic
Lapis Lazuli (polished cabochon)
Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)
metamorphic
Greenschist
Chlorite Schist (Greenschist Facies)
metamorphic
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Banded amphibolite (likely hornblende schist)
Amphibolite; chiefly hornblende + plagioclase, with possible biotite and garnet
metamorphic
Biotite Schist
Metamorphic Rock (Schist)
metamorphic
Greenstone
Chlorite schist or metabasalt depending on specific composition
Metamorphic
Graphite-rich schist (likely graphite ore)
Graphite-bearing schist; predominantly graphitic carbon (C) with mica, quartz, and possible feldspar
metamorphic
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Feldspar-rich Quartzite
Meta-arkose (Quartz-Feldspar Quartzite)
metamorphic
Milky Quartz with Iron Inclusions
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz-rich rock, likely quartzite
Quartzite; predominantly crystalline SiO₂, with minor iron-oxide staining and possible feldspar/mica
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Magnetite (Charnockite Regional Variation)
Magnetite (Fe3O4)
mineral
Yellow Quartzite (Onyx Pebble)
Silicon Dioxide (SiO2) - Quartzite
metamorphic
Ironstone / Weathered Hematite
Iron oxide-rich sedimentary rock with Goethite/Hematite
sedimentary
Almandine Garnet in Matrix
Almandine (Fe3Al2(SiO4)3)
metamorphic
Weathered quartz-rich rock, likely quartzite or silicified sandstone
Quartzite; predominantly microcrystalline to granular SiO₂, possibly with iron-oxide impurities
metamorphic
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Pebble
Lithified rock fragment / Sedimentary clast
sedimentary
Banded gneiss
Felsic biotite–quartz–feldspar gneiss
metamorphic
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
metamorphic
Ferruginous Conglomerate
Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))
sedimentary
Quartz (Milky or Clear Quartz fragment)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartzite
metamorphic
Slate
Slate; predominantly fine-grained phyllosilicates (muscovite/illite, chlorite) with quartz and feldspar
metamorphic
Dark metamorphic rock, likely schist or phyllite
Quartz–mica schist/phyllite; chiefly quartz, mica, and feldspar
metamorphic
Kyanite
Kyanite (Al2SiO5)
mineral
Pink Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Green Slate or Metamorphic Rock
Metamorphic rock (chlorite/actinolite-bearing)
metamorphic
Ferruginous Sandstone (with Iron Oxide staining)
Clastic Sedimentary Rock - Quartz Arenite/Wacke
sedimentary
Schist
Schist
metamorphic
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2) with various iron-oxide inclusions
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic