Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Category
Browse fossil specimens identified by the Rock Identifier community.
Limestone (Cliff Formation)
Limestone (predominantly CaCO3 as calcite)
Limestone
Calcium Carbonate (CaCO3)
Fossiliferous Limestone (Coquina / Shell Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
Ironstone Concretion
Siderite or Hematite Concretion
Flint Nodule
Microcrystalline Quartz (SiO2)
Chert Conglomerate (or Breccia)
Sedimentary Clastic Rock (variety: Ferruginous Chert Breccia)
Limestone
Calcium Carbonate (CaCO3)
Limestone
Calcium carbonate ( преимущественно CaCO3)
Sandstone (Painted)
Arenite (primarily SiO2)
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
Asphalt (Bituminous Pavement Bit)
Bitumen-bound aggregate (Petrochemical-bound composite)
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
Coquina (Fossiliferous Limestone)
Coquina (Organic Clastic Limestone)
Bituminous Coal
Bituminous coal (Organic Sedimentary Rock)
Sandstone Pebble
Arenite (primarily SiO2)
Chert (variously known as Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 with inclusions)
Sandstone (likely Quartzose Sandstone)
Arenite (SiO2 based)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
Quartz Geode
Silicon Dioxide (SiO2)
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
Sandstone
Arenite (primarily SiO2 - Silicon Dioxide)
Sandstone
Clastic sedimentary rock (primarily SiO2)
Limestone
Calcium Carbonate (CaCO3)
Amber (Rough)
Amber (Fossilized Tree Resin, succinite)
Glauconitic Sandstone (Greensand pebble)
Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)
Siltstone
Siltstone (primarily composed of SiO2)
Micaceous Sandstone or Quartzite
Sandstone (lithified quartz grains, often with mica) or Quartzite (metamorphosed sandstone)
Chert (Nodular)
Chert (SiO2 - Microcrystalline Quartz)
Limestone
Calcium Carbonate (CaCO3)
Shale with Plant Fossils / Carbonaceous Shale
Laminated Mudrock (Siliciclastic)
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
Glaucophane-bearing Schist (Blueschist)
Blueschist (Glaucophane-Lawsonite Schist)
Slate
Foliated low-grade metamorphic rock
Granitic Gneiss
Gneiss (Metamorphic Rock)
Chert / Flint
Microcrystalline Silica (SiO2)
Limestone
Calcium Carbonate (CaCO3)
Sandstone
Arenite (primarily SiO2)
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
Shale
Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)