Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Sodium Iron Aluminum Borosilicate)
mineral
Category
Metamorphic Rock
Browse metamorphic rock specimens identified by the Rock Identifier community.
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Tourmaline
Complex Borosilicate - Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite species)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Morganite (Pink Beryl)
Beryllium aluminum silicate Be3Al2(SiO3)6
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Green Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Quartz Geode (Cracked Open)
Quartz (Silicon Dioxide - SiO2)
mineral
Gneiss
Gneiss
metamorphic
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granodiorite
Granodiorite (containing Plagioclase, Quartz, and Biotite)
igneous
Granodiorite with Biotite Mica
Granodiorite (containing Quartz, Plagioclase Feldspar, and Biotite Mica)
igneous
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with various inclusions
sedimentary (geologically classified as a variety of chalcedony/quartz)
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Marble
Metamorphosed Limestone (principally CaCO3)
metamorphic
Epidote (likely Unakite component or Epidosite)
Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))
metamorphic
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Seraphinite
Clinochlore (a variety of the chlorite group)
mineral
Schist
Mica Schist (Composition typically involves Muscovite, Biotite, Quartz, and Feldspar)
metamorphic
Mica-rich Sandstone or Micaceous Schist Weathering
Micaceous Schist (Muscovite-Quartz composition)
Metamorphic or Sedimentary depending on local grade
Quartzite (with Iron Staining)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Quartz with Mica (likely Muscovite)
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride
igneous/metamorphic
Garnet
Garnet Group (often Pyrope or Almandine); X3Y2(SiO4)3
mineral
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Kyanite in Quartz
Al2SiO5 in SiO2
metamorphic
Sandstone (lithic/greywacke variant)
Clastic sedimentary rock (primarily SiO2 with rock fragments)
sedimentary
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Fossil Bivalve Shell
Class Bivalvia (e.g., Veneriidae family)
sedimentary
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(F,OH)2)
mineral
Sodalite
Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hypersthene
Enstatite (Hypersthene variety), (Mg,Fe)SiO3
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral