Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Category
Anthropogenic Mineral Mimic
Browse anthropogenic mineral mimic specimens identified by the Rock Identifier community.
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Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Slag
Anthropogenic Vitreous Silica/Iron oxides
mineral-like byproduct
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Diamond
Native Carbon (C)
mineral
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Bumblebee Jasper
Fossiliferous Calcite containing Orpiment and Realgar
sedimentary
Chlorite Included Quartz
Silicon Dioxide (SiO2) with Chlorite (Mg,Fe,Li)6AlSi3O10(OH)8
mineral
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Banded Agate (Brazilian Agate Slice)
Chalcedony (Silicon Dioxide / SiO2)
Mineral
Green Aventurine
Quartz containing Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Opalite
Synthetic Opalized Glass
mineraloid (man-made)
Quartz Druzy on Agate
Silicon Dioxide (SiO2)
mineral
Sandstone Geode (Ironstone Concretion)
Arenite with Limonite/Hematite matrix (SiO2 with Fe-oxides)
sedimentary
Siltstone
Siltstone (composed of mixed silicate minerals and clay)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz
sedimentary
Granite Pebble
Granite (Phaneritic intrusive igneous rock comprising Quartz, Feldspar, and Mica)
igneous
Titanium-coated Metal Cube (Man-made Fidget Toy)
Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)
Mineral alternative / Synthetic
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Opalite
Synthetic Glass (Hydrated Silica Simulant)
mineral
Chert with Manganese Dendrites / River Silt Overlays
Cryptocrystalline Quartz (SiO2) with Manganese Oxides
sedimentary
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Green Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
Mineral
K2 Stone (or K2 Jasper)
Azurite-in-Granite (Potassium Feldspar, Quartz, Plagioclase, Muscovite, and Azurite)
igneous
Peach Moonstone
Feldspar (KAlSi3O8) with inclusions
mineral
Banded Sandstone
Arenite with Liesegang banding (primarily SiO2 with FeO(OH) impurities)
sedimentary
Serpentine
Serpentinite (group of minerals: (Mg,Fe,Ni,Al)3Si2O5(OH)4)
metamorphic
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Banded Agate (Mutton-fat or Pork-stone variety)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary / Mineral
Lake Superior Agate
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Botswana Agate appearance)
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Banded Sandstone (Wonderstone)
Sandstone with Liesegang Rings (SiO2 with Iron Oxides)
sedimentary
Ferruginous Sandstone Pebble
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH) staining)
sedimentary
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
mineral