Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
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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Serpentine
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Quartz
Silicon dioxide (SiO2)
Mineral
Fossilized Bored Limestone
Limestone with Ichnofossils (Gastrochaenolites or Entobia)
sedimentary
Green Aventurine
Aventurine (Silicon dioxide, SiO₂)
Mineral; variety of Quartz
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Ruby
Corundum (Al2O3)
mineral
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Magnetite (Lodestone)
Magnetite (Fe3O4)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Gneiss
Foliated Metamorphic Rock
metamorphic
Petrified Wood
Silicified Wood (SiO2)
mineral
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Gneiss
Metamorphic Gneiss (High-grade regional metamorphism)
metamorphic
Beryl (likely Aquamarine) in matrix
Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)
mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Garnet Schist
Almandine-Garnet Schist
metamorphic
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Halite (Rock Salt)
Halite (Sodium Chloride, NaCl)
mineral
Garnet Schist
Almandine-Mica Schist
metamorphic
Greenschist
Chlorite schist
metamorphic
Golden Mica Schist
Mica Schist (primarily Muscovite/Biotite with Quartz)
metamorphic
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Schist (Kyanite Schist)
Kyanite-Mica Schist (primarily Al2SiO5, KAl2(AlSi3O10)(OH)2, and SiO2)
metamorphic
Slate
Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.
sedimentary
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Serpentine
Serpentine Group Minerals (e.g., Antigorite, Chrysotile, Lizardite)
Mineral, often found as a rock
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Garnet-Bearing Schist
Almandine Garnet Schist
metamorphic