Chert (often called Flint)
Chert (SiO2)
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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Red Jasper (Beaded Necklace)
Silicon dioxide (SiO2) with iron oxide inclusions
sedimentary
Banded Sandstone
Arenite with Liesegang banding
sedimentary
Blue Slag Glass
Amorphous Silica (Industrial byproduct)
Antropogenic (Man-made glass byproduct)
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Green Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Jasper (Iron-rich Chalcedony)
Jasper (Microcrystalline Silicon Dioxide, SiO2 plus iron oxide impurities)
Sedimentary / Metamorphic
Jasper
Silicon Dioxide (SiO2) microcrystalline quartz
sedimentary
Sandstone
Arenite
sedimentary
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Greywacke
Lithic Sandstone (Greywacke)
sedimentary
Gold Mineral
Native Gold (Au)
mineral
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Sandstone (Ferruginous)
Arenite (Siliclastic Sedimentary Rock)
sedimentary
Native Silver Nugget
Silver (Ag)
mineral
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron hydroxides
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Flint)
Chert (SiO2)
sedimentary
Chalcedony (specifically Agate or Common Opal variety)
Cryptocrystalline Silica (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Fossiliferous Limestone
Limestone (composed primarily of calcite with included fossils CaCO3)
Sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Fossilized Coral (Coquina/Limestone)
Cnidaria Anthozoa (Fossilized)
sedimentary
Banded Agate (Dyed)
Silicon Dioxide (SiO2) with impurities
mineral
Pink Tiger's Eye
Silicified Riebeckite Asbestos (SiO2)
metamorphic
Sandstone
Arenite (specifically sublithic or quartz arenite)
sedimentary
Pink Tumbled Agate (Dyed)
Silicon Dioxide (SiO2) with artificial dyes
mineral
Jasper (Iron-stained Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartzite
Quartzite (Metamorphic rock primarily composed of SiO2)
metamorphic
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral