Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Category
Man Made Rock (Technosol)
Browse man made rock (technosol) specimens identified by the Rock Identifier community.
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Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Petoskey Stone / Rugose Coral Fossil
Hexagonaria percarinata
fossil
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
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
Green aventurine bead bracelet
Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions
mineral
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
sedimentary
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Tumbled greenstone (likely serpentinite or green jasper)
Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
metamorphic
Fossilized Shark Tooth
Carcharocles sp. or Striatolamia sp. (Phosphate/Carbonate mineralized Hydroxyapatite)
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Diamond
Carbon (C)
mineral
Mixed beach-stone and tumbled-glass collection
Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper
mineral
Pink Marble
Recrystallized Limestone (Calcium Carbonate, CaCO3)
metamorphic
Stone bead bracelet
Unidentified polished natural-stone beads; possibly wood-grain jasper, agate, or serpentine
mineral
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)
sedimentary
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Chert Arrowhead (Lithic Tool)
Microcrystalline quartz (SiO2) - Archeological lithic artifact
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Flint
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (Nodule/Pebble)
Chert (Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Crushed Limestone
Calcium Carbonate (CaCO3)
Sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Possible basalt or industrial iron-rich slag
Basalt (plagioclase–pyroxene rock); identification uncertain from image
igneous
Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Chert (Nodular or Massive Variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Dolerite (Diabase)
Dolerite / Diabase
igneous
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Slag Glass (Cullet)
Amorphous Silica / Glass residue
Man-made byproduct (Non-geological)
Asphalt (Bituminous Concrete)
Bituminous mix / Anthropogenic conglomerate
man-made composite (lithified equivalent of sedimentary)
Blue Quartz (Aventurine)
Silicon Dioxide (SiO2) with fibrous inclusions (commonly Dumortierite)
mineral
Dyed turquoise-colored lava stone beads
Vesicular basalt (scoria), commonly sold as dyed lava rock
igneous
Diamond
Carbon (C)
gemstone