Fossil

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)