Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Chalcedony/Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Biotite Schist
Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Fluorite (Rainbow Fluorite Tower)
Fluorite (Calcium Fluoride, CaF2)
mineral
Calcite Geode
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Ferruginous Quartz
Quartz (Silicon Dioxide, SiO2) with Iron Oxides
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Sandstone
Arenite (composed primarily of Quartz: SiO2)
sedimentary
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt (Aphanitic Mafic Volcanic Rock)
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride - CaF2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
Mineral/Sedimentary
Native Copper (Penny specimen)
Native Copper (Cu)
mineral
Mica Schist
Mica Schist
metamorphic
Fluorite
Calcium fluoride (CaF2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Quartz (Smoky/Grey Variety)
Silicon Dioxide (SiO2)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide impurities
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral
Unakite or Epidosite
Epidosite (Mineral composition: Epidote, Feldspar, and Quartz)
metamorphic
Labradorite
Feldspar (Plagioclase Series), (Ca,Na)(Al,Si)4O8
mineral
Bornite
Bornite (Cu5FeS4)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Fluorite (likely Fluorite on Quartz/Matrix)
Calcium Fluoride (CaF2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Agate (specifically a Thunderegg/Agate Nodule)
Cryptocrystalline Quartz (SiO2)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral