Tiger Shark Fossil Tooth
Galeocerdo cuvier (fossilized)
sedimentary
Category
Anthropogenic Material (Man Made Rock)
Browse anthropogenic material (man made rock) specimens identified by the Rock Identifier community.
Learn about Anthropogenic Material (Man Made Rock) in the encyclopedia
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Diamond
Carbon (C)
mineral
Diamond ring
Diamond, crystalline carbon (C)
gemstone
Chert (often called Flint in archaeological contexts)
Silicon Dioxide (SiO2)
sedimentary
Rough Diamond
Pure Carbon (C)
mineral
Chert (specifically Flint)
Chert (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Polished River Pebble)
Chert (SiO2)
sedimentary
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Note: Item is a Synthetic/Man-made Object
Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)
Non-geological
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Phaneritic Igneous Rock (composed mostly of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Diamond (as set in a gold ring)
Carbon (C)
mineral
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
sedimentary
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (primarily SiO2 with Fe2O3)
sedimentary
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Pumice
Pumice (Vesicular volcanic glass)
Igneous
Grey Chalcedony
Silicon Dioxide (SiO2)
mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
US Penny
Cuprum (Copper: Cu) and Zincum (Zinc: Zn) Alloy
Man-made object (metal alloy)
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
mineral
Banded agate pendant (likely carnelian or brown-and-white chalcedony agate)
Agate, a banded variety of chalcedony; microcrystalline quartz, SiO₂, with iron-oxide coloration
gemstone
Desert Rose (Gypsum Rose)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Coquina
Bioclastic Limestone (Coquina)
sedimentary
Chert (varieties: Flint or Jasper)
Silicon dioxide (SiO2) / Microcrystalline Quartz
sedimentary
Chert / Flint
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Commonly known as Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Jasper/Common Chert Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled greenstone, likely nephrite jade
Nephrite jade (interlocking tremolite–actinolite amphibole; Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
metamorphic
Red Sandstone
Arenite (Iron-rich)
sedimentary
Polished/tumbled brown-and-white mineral fragment
Indeterminate; possibly quartz-rich jasper, brecciated jasper, or an iron-stained quartz mineral
mineral
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary