Gneiss
Gneiss
metamorphic
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
metamorphic
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Mica Schist
Mica Schist (Muscovite subclass)
metamorphic
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Banded Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Banded Gneiss (River Rock/Pebble)
Gneiss (specifically a banded variety, likely a orthogneiss or paragneiss depending on parent rock)
Metamorphic Rock
Chert (within Limestone)
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) matrix
sedimentary
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Gneiss
High-grade regional metamorphic rock
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
mineral
Gneiss
Gneiss (Metamorphic rock)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Coarse-grained gray metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss (probable)
metamorphic
Ferruginous Sandstone (Ironstone)
Arenite with Iron-Oxide Cement (FeO(OH)·nH2O / Fe2O3)
sedimentary
Greenstone (Greywacke or Nephrite Jade variant)
Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)
metamorphic
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Hematite
Iron Oxide (Fe2O3)
mineral
Amphibolite
Amphibolite
metamorphic
Native Silver Nugget
Silver (Ag)
mineral
Iron-stained quartzite (likely)
Quartzite, predominantly quartz (SiO₂), with iron-oxide staining and possible mica/feldspar
metamorphic
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss Pebble
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) within a geode
sedimentary
Tiger iron slab (likely polished banded iron formation)
Banded iron formation (BIF), chiefly hematite/magnetite, quartz, and iron-rich amphibole or jasper
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Serpentine
Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)
Mineral, often found as a rock
Mica Schist with Quartz
Mica Schist (Quartz-Muscovite Schist)
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock formed from granitic precursor)
metamorphic
Ferruginous Breccia
Breccia with Iron-rich (Hematite/Goethite) Matrix
sedimentary