Chert (Jasper/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Category
Antropogenic (Man Made Material)
Browse antropogenic (man made material) specimens identified by the Rock Identifier community.
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Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Slate
Metamorphic pelitic rock
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Diamond in Kimberlite
Diamond (C in Kimberlite)
igneous
Chert (Flinty variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Malaysian 50 Sen Coin
Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)
Man-made object (coin)
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Green Aventurine
Quartz (SiO2) with Fuchsite inclusions
Mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (in jewelry setting)
Diamond (C - Carbon)
mineral
Blue opalite (often sold as synthetic opal)
Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)
gemstone
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Blue gemstone bead bracelet, likely lapis lazuli or dyed stone
Uncertain from image; possible lazurite-bearing lapis lazuli (Na₃Ca(Si₃Al₃)O₁₂S) or dyed quartz/glass imitation
gemstone
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
sedimentary
Chert (Arrowhead Fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Megalodon Shark Tooth
Otodus megalodon
fossil
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically White Chert or Novaculite)
Silicon Dioxide (SiO₂)
sedimentary
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
gemstone
Tumbled iron-rich stone, likely hematite-bearing jasper
Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite/goethite
mineral
Carved quartz (likely rose quartz and green aventurine/quartz)
Quartz, silicon dioxide (SiO₂); green material may be aventurine quartz or serpentine
gemstone
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Coquina
Coquina (Bioclastic Limestone)
sedimentary
Slag
Anthropogenic Vitrification Product / Silicate Slag
Anthropogenic (Man-made industrial byproduct)
Diamond (or Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Diamond (in a jewelry setting)
Carbon (C)
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Diamond
Carbon (C)
gemstone
Granite
Granite (a plutonic rock)
Igneous
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
sedimentary
Diamond (in Jewelry Setting)
Carbon (C)
gemstone
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Chert (Iron-stained)
Chert (Microcrystalline and Cryptocrystalline Quartz, SiO2)
sedimentary