Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Category
Anthropogenic (Man Made Material Mimicking Sedimentary Rock)
Browse anthropogenic (man made material mimicking sedimentary rock) specimens identified by the Rock Identifier community.
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Blue Goldstone
Man-made glass with crystalline copper/cobalt inclusions
mineral
Goldstone
Aventurine Glass (Man-made glass with copper inclusions)
mineraloid / man-made glass
Sandstone
Arenite
sedimentary
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Diamond / Clear Quartz / Glass paste
Carbon (Diamond) / Silicon Dioxide (Quartz)
gemstone
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Opalite glass sphere (likely synthetic imitation)
Man-made opalescent glass; not natural opal
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Opalite
Man-made Glass (Synthetic Opalized Glass)
mineral
Dalmatian Stone
Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)
igneous
Picture Jasper
Silicon Dioxide (SiO2)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Ironstone Concretion (Pot Stone)
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Chert Arrowhead (Lithic Artifact)
Microcrystalline Quartz (SiO2)
sedimentary
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Slag Glass
SiO2 (Silicon Dioxide) with impurities
man-made glass
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Vesicular basalt (weathered scoria)
Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides
igneous
Opalite
Synthetic Opalite Glass (Silicon Dioxide)
mineraloid (man-made)
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite (SiO2 composition dominant)
sedimentary
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Opalite
Man-made glass (traditionally simulated Opal)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
mineral
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (SiO2)
sedimentary
Unidentified gray stone/concrete-like fragment
Indeterminate; likely a fine-grained carbonate or cementitious geological fragment
sedimentary
Dyed or synthetic turquoise-blue glass-like specimen
Likely man-made colored glass or resin; exact identification requires testing
mineral
Green sea glass (likely bottle glass)
Man-made soda–lime silicate glass; not a natural mineral
mineral
Clear quartz tumbled stone
Quartz (silicon dioxide, SiO₂)
mineral
Sea Glass (White/Clear)
Amorphous Silica (Alkali-Lime-Silica Glass), SiO2 + Na2O + CaO
Anthropogenic (Man-made product subject to geological processes)
Sandstone (with potential Arkose/Lithic characteristics)
Arenite (Sedimentary rock composed of sand-sized grains)
sedimentary
Quartzite (Engineered Stone)
Silicon Dioxide (SiO2) based synthetic composite
metamorphic
Aura Quartz Geodes (Lab-Altered)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition
mineral
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral