Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Category
Fossil
Browse fossil specimens identified by the Rock Identifier community.
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
mineral
Shale
Fissile Mudrock (Clay-rich Sedimentary Rock)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Coquina / Fossiliferous Limestone
Coquina (composed primarily of Calcium Carbonate / CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Handaxe with Inlaid Fossil Echinoid
Flint / Chert (SiO2) containing a fossil Conulus albogalerus
sedimentary (cryptocrystalline silica)
Belemnite (Fossilized Rostrum)
Belemnitida (Order), composed of Calcite (CaCO3)
sedimentary
Sandstone (likely Graywacke or Arkose variant)
Clastic Sedimentary Rock (Lithic Sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Fossiliferous Shale Matrix
Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments
sedimentary
Amber
Succinite
Organic mineraloid
Sandstone Concretion
Clastic sedimentary rock (primarily Quartz SiO2)
sedimentary
Chert (concretionary/nodular variant)
Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) Rich Bio-sedimentary Rock
sedimentary
Crushed Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (Crinoidal)
Bioclastic Limestone (predominantly CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Yellow/Brown Chert or Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Coquina Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Agatized Fossil (Druzy Agate)
Silicon Dioxide (SiO2) replacing organic matter
sedimentary
Fossiliferous Chert (Gryphaea Fossil)
Silicon Dioxide (SiO2) with Calcitic Mollusk Remnants
sedimentary
Ironstone Nodule (Ironstone Concretion)
Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)
sedimentary
Sandstone with trace fossil
Sandstone, possibly with Skolithos or similar trace fossil
sedimentary
Chert (with small quartz inclusion)
Microcrystalline Silica (SiO2)
sedimentary
Dendritic Agate (Tree Agate)
Chalcedony (Silicon Dioxide, SiO2) with Manganese or Iron Oxide inclusions
mineral
Petrified Wood
Silicified Wood (SiO2 - Silicon Dioxide)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
metamorphic
Calamites (Fossilized Horsetail)
Calamites suckowii (Family: Calamitaceae)
sedimentary
Fossiliferous Limestone
Calcite (CaCO3) with Bioclastic inclusions
sedimentary
Sandstone
Arenite (SiO2 based with mineral cement)
sedimentary
Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Sandstone (likely Quartzose Sandstone with mineral staining)
Arenite (composed mainly of SiO2)
sedimentary
Sandstone (with banding/weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe2O3 staining)
sedimentary
Sandstone (Red Sandstone)
Arenite (SiO2 based with Fe2O3 staining)
sedimentary