Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Category
Man Made Object (Metal Alloy)
Browse man made object (metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Object (Metal Alloy) in the encyclopedia
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Peacock Ore
Bornite (Cu5FeS4)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Greenstone / Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Diamond (in a metal ring setting)
Diamond (Pure Carbon, C)
mineral
Fluorite (Rainbow Fluorite)
Calcium Fluoride (CaF2)
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Basalt
Basalt (extrusive volcanic rock)
igneous
Sunstone (Heliolite)
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Ironstone Concretion (Limonite/Goethite)
Ironstone (primarily FeO(OH)·nH2O)
sedimentary
Diamond (Cut Gemstones in Jewelry)
Carbon (C)
gemstone
Milky or Iron-Stained Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (primarily muscovite and biotite)
metamorphic
Rose Quartz
Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Green Fluorite
Calcium Fluoride (CaF2)
mineral
Fluorite (Purple variety)
Calcium Fluoride (CaF2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or Chalcopyrite treated with acid
mineral
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (composed primarily of Magnetite Fe3O4, Hematite Fe2O3, and Chert/Quartz SiO2)
sedimentary
Banded Iron Formation (BIF)
Banded Iron Formation (Magnetite/Hematite-Chert)
sedimentary
Slag (Industrial By-product)
Glassy silicate or metallic smelting residue
mineral-like (anthropogenic)
Serpentinite with Quartz/Calcite Veining
Serpentinite (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Peacock Ore (Chalcopyrite)
Chalcopyrite (CuFeS2)
mineral
Polished green serpentine (likely antigorite-rich)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible chlorite, magnetite, and talc
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
sedimentary
Pyrite-bearing metamorphic rock (likely schist or gneiss)
Pyrite (FeS₂) in a quartz–mica-rich host rock
metamorphic
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Quartz Pebble (with Manganese dendrites/staining)
Silicon Dioxide (SiO2) with Manganese Oxide impurities
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Rose Quartz
Rose Quartz (SiO₂)
Mineral
Ironstone Concretion (Desert Varnish / Hematite-Goethite Nodule)
Iron oxide / hydroxide deposit (predominantly Fe2O3 and FeO(OH))
sedimentary
Dendritic Agate (River Pebble)
Silicon Dioxide (SiO2) with Manganese or Iron oxide inclusions
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Serpentinite (with Pyrite/Garnet inclusions)
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3Si2O5(OH)4
metamorphic
Fluorite (often called Rainbow Fluorite or Purple-Green Fluorite)
Calcium Fluoride (CaF2)
mineral