Iron-Nickel Meteorite fragment
Siderite (meteoritic iron), composed primarily of Kamacite (α-(Fe,Ni)) and Taenite (γ-(Fe,Ni))
mineral
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
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Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Concrete with Exposed Aggregate
Anthropogenic conglomerate (Concrete)
man-made rock (sedimentary analogue)
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Rhodonite
Manganese silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Iron-rich concretion or slag-like mineral fragment
Likely limonite/goethite (FeO(OH)·nH₂O), possibly magnetite-bearing material
mineral
Small dark mineral/rock fragment
Indeterminate; possibly magnetite-bearing basalt or iron-rich slag
mineral
Black Jasper
Silicon dioxide (SiO2) with carbon/mineral inclusions
sedimentary
Weathered gray stone, likely granite or gneiss
Probable granitic rock; exact identification is uncertain from the image
igneous
Chert (Cream Variety)
Microcrystalline silica (SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
sedimentary
Black Jasper
Black Jasper (Silicate mineral - SiO2)
sedimentary
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Stainless Steel (Polished)
Ferrous Alloy containing Iron (Fe), Chromium (Cr), and Carbon (C)
Mineral equivalent / Metal Alloy
Dark weathered pebble, likely basalt
Basalt (fine-grained mafic volcanic rock; commonly plagioclase, pyroxene, and iron oxides)
igneous
Green Moonstone (Garnierite)
Nickel-bearing Magnesium Silicate (often a mix of Serpentine and Talc/Chlorite groups)
mineral
Milky Quartz Pebble with Iron Inclusions
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Shale with Pyrite
Clastic sedimentary rock containing Iron Disulfide (FeS2)
sedimentary
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Asphalt Concrete
Bituminous Concrete (Anthropic Rock)
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Sea Glass
Amorphous Silicon Dioxide (Man-made glass weathered by nature)
mineral
Red Sandstone
Arenite (primarily composed of SiO2 with Fe2O3 cement)
sedimentary
Coprolite
Fossilized Feces
fossil
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Iron-rich meteorite candidate
Unclassified meteoritic iron–stone material; possible stony-iron meteorite or terrestrial ironstone
meteorite
Fossilized cylindrical shell or bone fragment
Indeterminate biogenic carbonate or phosphatic fossil; possible fragment of a tubular shell (e.g., scaphopod) or hollow bone
fossil
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Chromium (Chrome)
Chromium (Cr)
mineral
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Gold Nugget
Native Gold (Au)
mineral
Blue Dyed Quartzite
Silicon Dioxide (SiO2) with artificial pigment
metamorphic