Sedimentary (Silicified Fossiliferous Chalcedony)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement (SiO2 + Fe2O3)

Limestone

Calcium Carbonate (CaCO3)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Sandstone (Yellow/Tan)

Clastic sedimentary rock (primarily SiO2 with iron oxide staining)

Chert

Chert (Microcrystalline Silica, SiO2)

Shale or Siltstone

Sedimentary Clastic Rock (Variable mineral composition including quartz and clay minerals)

Limestone

Calcium Carbonate (primarily CaCO3 as Calcite or Aragonite)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone with Calcite Crystals

Calcium Carbonate (CaCO3)

Limonite and Goethite encrusted Chert/Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)

Bituminous Coal

Organic Sedimentary Rock (composed mostly of carbon with sulfur and hydrogen)

Red Sandstone

Clastic Terrigenous Sedimentary Rock (primarily SiO2 with Fe2O3 coating)

Ferruginous Sandstone (Ironstone)

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Red Sandstone (Iron-rich Sandstone)

Clastic Sedimentary Rock - Quartz Arenite / Arkose with Hematite Cement

Ferruginous Sandstone

Clastic sedimentary rock (primarily Quartz with Iron Oxide cement)

Sandstone (specifically Cross-bedded Sandstone)

Arenite (composed primarily of SiO2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gypsum (Wallboard/Drywall)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Ferruginous Sandstone (Iron-rich Sandstone)

Ferruginous Arenite

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Grey-Green Flint)

Microcrystalline silicon dioxide (SiO2)

Limonite (Ironstone Concretion)

Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)

Chert (White Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Belemnite (Fossilized Rostrum)

Belemnitida (Order), composed of Calcite (CaCO3)

Ammonite Fossil (Polished Half)

Ammonoidea (subclass)

Fossil Shell (Bivalve)

Class Bivalvia (Likely a member of the Ostreidae or Gryphaeidae family), CaCO3

Chert (Nodule)

Cryptocrystalline Silica (SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (specifically White Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenicola (comprising mostly Quartz, SiO2)

Chert (Flint)

Chert (microcrystalline quartz)

Chert (or Flint)

Silicon dioxide (SiO2)

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Red Sandstone

Arenite with Hematite cementation

Belemnite Fossil (Guard)

Belemnoidea (Carbonate/Calcite replacement)

Limonite Concretion

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Sandstone

Arenite (primarily SiO2)

Green Chert (Jasper)

Silicon Dioxide (SiO2)