Vesicular Basalt with Oxidation
Scoriaceous Olivine Basalt (Mafic volcanic rock)
igneous
Category
Metamorphic Rock (Primarily Composed Of Minerals)
Browse metamorphic rock (primarily composed of minerals) specimens identified by the Rock Identifier community.
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Red Quartzite / Jasper-rich Pebble
Quartzite (primarily SiO2 with hematite inclusions)
metamorphic
Granite
Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)
igneous
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Quartzite (Sugar Quartz)
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral / metamorphic
Quartzite Cobble
Quartzite (SiO2)
metamorphic
Unakite
Unakite-Epidote Granite
metamorphic
Black Spinel
Magnesium Aluminum Oxide (MgAl2O4)
mineral
Sandstone (Ferruginous)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Granite River Pebbles
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Iron-Oxide Concretion (Moqui Marble)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Travertine (Tufa)
Chemical Sedimentary Limestone (CaCO3)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Hematitic Sandstone
Sandstone with Iron Oxide (Hematite) staining
sedimentary
Gneiss (Metamorphic Cobble)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Botryoidal Chalcedony with Calcite
Chalcedony (SiO2 with accessory minerals, likely CaCO3)
Mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Magnetite with Pyroxene
Magnetite (Fe3O4) in Mafic Igneous Matrix
mineral/igneous
Lapis Lazuli
Complex mixture containing Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite
metamorphic
Magnetite Orthorthotropic Rock
Magnetite (Fe3O4)
mineral
Turquoise
Hydrated phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Yellow Aventurine (Yellow Quartzite)
Silicon Dioxide (SiO2) with inclusions
metamorphic
Rhodonite
Rhodonite (Mn2+SiO3)
mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Jasper with Epidote Vein
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Schist with Garnet inclusions
Garnet-mica-schist
metamorphic
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Quartz Vein / Milky Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)
mineral
Ferruginous Sandstone
Clastic Sedimentary Rock (Sandstone with Iron Oxide cement)
sedimentary
Schist with Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral