Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
Learn about Mineral Description (Anthropogenic Material) in the encyclopedia
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Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Chert (Arrowhead Debitage or Flake)
Microcrystalline silica (SiO2)
sedimentary
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Greenstone Celt (Polished Stone Axe)
Metamorphosed mafic rock (often Basalt or Diabase)
metamorphic
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Slag
Anthropogenic Vitreous Silicate / Ferro-silicate Slag
igneous
Slag (Industrial Glass)
Anthropogenic Vitreous Slag (Post-industrial byproduct)
igneous
Ferro-Manganese Slag
Vitreous Silicate Slag
Anthropogenic (Industrial byproduct)
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
Concrete with Aggregate
Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)
anthropogenic (human-made) sedimentary-like material
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Obsidian Arrowhead
Volcanic Glass (Primary composition: SiO2)
igneous
Cobalt Blue Sea Glass
Amorphous Silica Glass (SiO2 + CoO)
mineraloid / anthropogenic material
Concrete Fragment
Hardened Portland Cement Composite
Anthropogenic (Man-made material mimicking sedimentary rock)
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Sandstone
Arenite (SiO2 based)
sedimentary
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Note: This is a Man-Made Object (Costume/Prop Patch)
Synthetic fiber and pigments (Cellulose/Plastic-based composite)
Non-geological
Paper (Cellulose)
Cellulose (C6H10O5)n
Organic (Anthropogenic)
Sandstone
Arenite (primary component SiO2)
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Polished Mexican “Crazy Lace” agate tower
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions
mineral
Gastropod shell fragment
Calcareous mollusk shell; primarily aragonite or calcite (CaCO₃)
fossil
Sandstone
Sandstone (SiO2-rich clastic sedimentary rock)
sedimentary
Note: No specimen visible
N/A
Tektite (likely indochinite)
Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium
mineral
Nephrite Jade
Nephrite
Mineral/Rock
Sandstone (Tumbled/River Pebble)
Arenite (composed primarily of SiO2)
sedimentary
Petrified Wood
Silicified Wood
fossil
Petrified Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil