Granite
Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).
igneous
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
Learn about Metamorphic Rock (Primarily Composed Of Minerals) in the encyclopedia
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Garnet
Garnet group species (likely Almandine, Fe3Al2(SiO4)3)
mineral
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Boxwork Quartz / Septarian Jasper
Boxwork (SiO2 with iron oxide inclusions)
metamorphic
Fuchsite
Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)
mineral
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Grey Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Iron-stained Quartz (Gossan/Limonite-coated Quartz)
Silicon Dioxide (SiO2) with Hydrated Iron Oxides (FeO(OH)·nH2O)
mineral
Schist
Schist
metamorphic
Muscovite Mica (Golden/Yellow variety)
KAl2(AlSi3O10)(F,OH)2
mineral
Granite
Granite
igneous
Specular Hematite
Specularite (Fe2O3)
mineral
Basalt (Polished Pebble)
Basalt (Mafic volcanic rock)
igneous
Gneiss
Gneiss
metamorphic
Sandstone
Arenite
sedimentary
Chalky Limestone
Carbonate sedimentary rock (CaCO3)
sedimentary
Strawberry Quartz
Quartz with Hematite or Goethite inclusions (SiO2 + inclusions)
mineral
Agate (Moss or Dendritic Agate)
Chalcedony (Silicon Dioxide, SiO2)
mineral
Calcite
Calcite (CaCO3)
Mineral
Sandstone
Arenite (composed of SiO2, CaCO3, or iron oxides)
sedimentary
Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)
Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)
Metamorphic
Iron Meteorite
Iron-nickel alloy (primarily kamacite and taenite)
Mineral/Rock (Extraterrestrial Origin)
Schist
Mica Schist
metamorphic
Pink Feldspar
Orthoclase Feldspar (KAlSi3O8)
mineral
Serpentinite
Serpentine rock (Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al,Fe)2O5(OH)4
metamorphic
Quartzite
Hydrothermal Quartz or Quartzite (SiO2)
metamorphic
Granite
Granite (phaneitic intrusive igneous rock)
igneous
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Gneiss (Metamorphosed Pebble)
Gneiss with Quartz/Feldspar banding
metamorphic
Banded Gneiss
Gneiss (Metamorphic high-grade rock)
metamorphic
Sandstone
Arenite (often composed of Quartz, SiO2)
sedimentary
Druzzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Calcite
Calcite (CaCO3)
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral