Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
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Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Slag (Industrial Byproduct)
Ferro-silicate glass (Slag)
Anthropogenic (Man-made industrial deposit)
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Tumbled carnelian (likely chalcedony)
Carnelian, orange-red cryptocrystalline quartz (SiO₂), a variety of chalcedony
gemstone
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Black Obsidian
Amorphous volcanic glass (SiO2 + impurities)
igneous
Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Diamond
Native Carbon (C)
mineral
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Diamond
Carbon (C)
gemstone
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Lava Rock (Dyed)
Basalt / Volcanic scoria
igneous
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Iron Slag
Anthropogenic Vitreous Ferrous Silicate
industrial byproduct (anthropogenic)
Chert (Arrowhead)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz with Basalt inclusion
Silicon Dioxide (SiO2) with mafic silicate rock
igneous and sedimentary/metamorphic mix
Blue-dyed magnesite beads (often sold as “turquoise howlite”)
Magnesite, MgCO₃; commonly dyed blue and possibly marketed as dyed howlite, Ca₂B₅SiO₉(OH)₅
mineral
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Asphalt Pavement (with aggregate)
Asphalt concrete
man-made composite
Nutting Stone / Cupstone (Sandstone or Quartzite)
Sedimentary rock with anthropogenic modification (cupule)
sedimentary
Likely tumbled jasper or iron-rich chert
Microcrystalline quartz (SiO₂), potentially hematite/goethite-bearing
mineral
Obsidian Arrowhead
Obsidian (Volcanic Glass)
igneous
Jasper
Jasper (Silicified microcrystalline quartz) - SiO2
sedimentary
Chert Arrowhead
Microcrystalline Quartz (SiO2)
sedimentary
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
sedimentary (anthropogenic/technogenic)
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Native Carbon (C)
gemstone
Blue goldstone beads
Man-made aventurine glass (silica glass with metallic copper inclusions), not natural lapis lazuli
mineral
Carved serpentine wing sculpture
Serpentine-group rock, chiefly antigorite/lizardite: Mg3Si2O5(OH)4
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Tumbled blue glassy mineral, possibly sodalite or blue aventurine
Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material
mineral