Fossil Snail
Gastropoda fossil
fossil
Category
Anthropogenic (Man Made Material)
Browse anthropogenic (man made material) specimens identified by the Rock Identifier community.
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Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Blue Cat's Eye Quartz (Heated/Dyed)
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Vuggy Limestone
Carbonate Sedimentary Rock with Vuggy Porosity (CaCO3)
sedimentary
Flint
Chert (SiO2)
sedimentary
Sandstone
Arenite (SiO2 predominantly)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Sandstone
Arenite (primarily SiO2)
sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint Nodular)
Silicon Dioxide (SiO2)
sedimentary
Shark Tooth Fossil
Carcharodonta (order Lamniformes), likely Carcharias spp.
fossil
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Flint (Chert)
Cryptocrystalline Quartz (SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Black Jasper
Silicon Dioxide (SiO2) with impurities
sedimentary
Megalodon Shark Tooth Fossil
Otodus megalodon (fossilized in sedimentary matrix)
sedimentary
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Gypsum (Wallboard/Drywall)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
sedimentary
Chert Nodule
Chert (SiO2)
sedimentary
Geode (Unopened)
Vug or Geode (primarily Silicon Dioxide, SiO2)
sedimentary
Chert (Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Red Jasper
Quartz (Silicon Dioxide) with Hematite inclusions, SiO2
mineral
Chert (Jasper)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Bicolor Quartz Tumble
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (containing Flint and Calcareous inclusions)
Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) impurities
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Tumbled goldstone-like quartz pebble
Likely iron-stained quartz or jasper; exact identification requires testing
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
White Jade (Nephrite)
Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2
Mineral
Blue-gray metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica assemblage; exact identification requires testing
metamorphic
Iron-stained chert or jasper pebble
Microcrystalline quartz (SiO₂), likely hematite/goethite-bearing
sedimentary
Polished red jasper (likely hematite-bearing jasper)
Jasper, microcrystalline quartz (SiO₂), colored chiefly by iron oxides such as hematite/goethite
mineral
Milky quartz with iron-oxide staining
Quartz, silicon dioxide (SiO₂), likely massive or coarsely crystalline; brown areas are limonite/goethite staining
mineral
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Red jasper
Jasper (microcrystalline quartz, SiO₂), iron-oxide-rich variety
mineral