Sedimentary (Fossilized)

Jasper (likely Brown or Brecciated)

Jasper (Silicon Dioxide, SiO2)

Sandstone

Arenite (primarily SiO2)

Geode with Quartz and Chalcedony

Silicon Dioxide (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)

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)

Yellow Jasper

Silicon Dioxide (SiO2)

Chert (Banded Variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Gastropod Fossil (Snail Internal Mold)

Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (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)

Ammonite Fossil (Polished Half)

Ammonoidea (subclass)

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 (Flint nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Dalmatian Jasper

Peralkaline rhyolite

Ferruginous Sandstone

Sandstone, Iron-rich

Chert (Brown variety / Common Jasper)

Microcrystalline Quartz (SiO2)

Red Sandstone

Arenite with Hematite cementation