Sandstone
Arenite (SiO2 primarily)
sedimentary
Category
Sedimentary (Fossilized Organic Matter)
Browse sedimentary (fossilized organic matter) specimens identified by the Rock Identifier community.
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Fossilized Mammoth Tooth Fragment
Mammuthus primigenius (or Mammuthus sp.)
fossil
Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Coprolite
Coprolite
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda
fossil
Dendritic Agate (or Dendritic Opal)
SiO2 (for Agate), SiO2·nH2O (for Opal)
Mineral
Petoskey Stone
Hexagonaria percarinata (Calcite / CaCO3)
fossil
Collection of Minerals and Ores
Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Fossilized Horn Coral
Rugosa (Tetracoralla)
fossil
Fossilized Shark Tooth (Megalodon or Carcharocles fragment)
Elasmobranchii (Fossilized tooth root / crown section)
fossil
Petrified Wood
Silicified Wood (primarily quartz/chalcedony replacing organic wood structure)
fossil
Fossiliferous Limestone / Petoskey Stone (Coral Fossil)
Hexagonaria percarinata / Calcite (CaCO3)
fossil
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Fossilized Brachiopod
Phylum Brachiopoda (replaced by Calcite/CaCO3)
sedimentary
Fossilized Coral
Rugose Coral / Hexagonaria (Fossilized calcium carbonate)
fossil
Fossilized Brachiopod
Brachiopoda (likely Order Spiriferida or Productida)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Flint / Chert (Fossiliferous)
Silicon dioxide (SiO2) with microcrystalline quartz
sedimentary
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Greywacke with Quartz Vein
Matrix: Impure Sandstone (SiO2 + varied clasts), Veins: Quartz (SiO2)
sedimentary
Kambaba Jasper
Rhyolite (with Stromatolite fossil inclusions)
sedimentary
Fossilized Coral
Cnidaria (Hexacorallia)
fossil
Amber (Simulated/Faturan Style)
Resin mix (Likely Phenolic/Celluloid if synthetic, Succinite if natural)
Organic Gemstone (not a mineral)
Coal
Bituminous or sub-bituminous coal (carbonaceous rock)
sedimentary
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Calligraphy Stone
Mariam Jasper (Fossiliferous Limestone composed of Hematite and Shell remains)
sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Ironstone Concretion / Chert Nodules
Iron-rich Sedimentary Concretion (Fe2O3 / SiO2 mix)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)
fossil
Amber
Succinite (organic mineraloid); Chemical formula: C10H16O
mineral
Sandstone
Arenite
sedimentary
Tumbled amber
Amber (fossilized plant resin; commonly succinite, C10H16O)
gemstone
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary
Sandstone Pebble
Arenite (SiO2 complex)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Kambaba Jasper
Stromatolite / Fossilized Algae (Rhyolitic structure)
sedimentary
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Cyanobacteria fossile)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary