Fossil Shell
Brachiopod or Mollusk fossil
Category
Browse sedimentary (artificial) specimens identified by the Rock Identifier community.
Fossil Shell
Brachiopod or Mollusk fossil
Quartz Pebble
Silicon Dioxide (SiO2)
Sandstone
Sandstone (SiO2 rich)
Red Siltstone
Siltstone (composed of Quartz and Clay minerals)
Quartzite River Cobble
Quartzite (primarily SiO2)
Chert (Yellow Jasper/Flint)
Silicon Dioxide (SiO2)
Banded Chert (Iron-stained)
Microcrystalline Quartz (SiO2) with Iron Oxides
Fossil Coral
Rugosa or Tabulata coral fossil
Chert (Brecciated or Veined)
Microcrystalline Quartz (SiO2)
Fossil Bone Fragment
Petrified bone (permineralized hydroxyapatite)
Sandstone (Banded)
Arenite with Iron Oxide Banding
Glauconitic Sandstone
Glauconitic Sandstone (Greensand)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (Arrowhead artifact)
Chert (Cryptocrystalline Silica, SiO2)
Mosasaur Tooth Fossil
Mosasauridae (likely Prognathodon or Mosasaurus)
Ironstone Concretion
Ferruginous Concretion (Fe2O3·nH2O)
Conglomerate
Conglomeratic Sandstone
Chert (Flint)
Microcrystalline Quartz (SiO2)
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
Chert (Iron-stained)
Silicon Dioxide (SiO2) with Iron Oxides
Sandstone
Arenite (SiO2 based)
Red Sandstone
Arenite (SiO2 based with Fe2O3)
Siltstone with Sandstone Bands
Siltstone (composed of Quartz and Clay minerals)
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Quartzite with Hematite staining
Metamorphosed Quartz Sandstone (SiO2)
Chert
Silicon dioxide (SiO2)
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
Chert (Yellow Jasper/River Pebble)
Microcrystalline Quartz (SiO2)
Chert (Iron-stained)
Silicon Dioxide (SiO2)
Fossilized Crab Carapace (Concretion)
Decapoda (fossil), typically preserved in calcite or siderite concretion
Milky Quartz
Silicon Dioxide (SiO2)
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
Chert (variations include Flint)
Chert (SiO2)
Sandstone with Iron Concretion
Arenite with Limonite/Goethite Concretion
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
Chert (potentially Flint or Mudstone)
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (SiO2 primarily)
Calamites Fossill (Lepidodendrales)
Calamites sp. (Family Calamitaceae)
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
Banded Chert
Cryptocrystalline Quartz (SiO2)
Fossilized Shark Tooth
Bioapatite (Calcium Hydroxyapatite) replacement