Chert (Chalky Flint Node)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Anthropogenic Specimen (Man Made Material)
Browse anthropogenic specimen (man made material) specimens identified by the Rock Identifier community.
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Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Blue Goldstone
Synthetic glass with cobalt and copper inclusions
man-made glass
Blue Goldstone
Man-made glass with cobalt and metal flecks
man-made glass
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Polished black stone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition
igneous
Metal Alloy (Likely Pewter or Sterling Silver)
Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).
Man-made material (metal)
Tumbled Clear Quartz/Rock Crystal
Silicon Dioxide (SiO2)
mineral
Cullet Glass (Slag)
Amorphous Silicon Dioxide (Man-made)
Mineraloid
Man-made Synthetic Material (Plastic/Composite)
Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)
Non-geological / Synthetic
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
sedimentary
Crackled Quartz (Dyed)
Silicon Dioxide (SiO2)
mineral
Opaline Glass (Opalite)
Synthetic Silicon Dioxide Glass
Mineraloid (Man-made)
Fordite
Anthropogenic paint-rock
mineraloid (human-made geological specimen)
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Crackled Quartz (Blue Dyed)
Silicon Dioxide (SiO2) with anthropogenic dye
mineral
Green Obsidian Sphere (man-made glass)
Vitreous Silica with Chromium/Iron additives
mineralogical simulant
Chert (Arrowhead Shard)
Microcrystalline silica (SiO2)
sedimentary
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Cubic Zirconia
Cubic Zirconium Dioxide (ZrO2)
gemstone
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Acrylic or Resin (Synthetic Imitation)
Polymethyl Methacrylate (PMMA) or Polyepoxide
Synthetic/Man-made Polymer
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
Mohave Turquoise (Composite/Stabilized)
Hydrated copper aluminium phosphate (CuAl6(PO4)4(OH)8·4H2O) with stabilizing resin and metallic inclusions
mineral
Possible weathered basalt or slag fragment
Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image
igneous
Porcelain (White Ceramic)
Mullite-bearing Vitrified Ceramic (Major phases: Mullite Al6Si2O13, Glassy Silica SiO2)
metamorphic
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Tumbled milky quartz pebble
Quartz (silicon dioxide, SiO₂), opaque-to-translucent milky variety
mineral
Chert (often called Flint in archaeological contexts)
Microcrystalline or cryptocrystalline Silica (SiO2)
sedimentary
Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Anthropogenic (Man-made)
Opalite
Man-made Glass (SiO2 + additives)
mineraloid (synthetic)
Asphalt Concrete (Bituminous Concrete)
Bituminous aggregate
sedimentary
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Brick fragment (Man-made material)
N/A (Fired clay)
man-made