Sedimentary (Silicified Fossiliferous Chalcedony)

Sandstone (with Iron Staining)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Sandstone

Arenite (primarily SiO2)

Chert (Yellow Jasper)

Silicon Dioxide (SiO2)

Chert (specifically Red Chert/Jasper variety)

Silicon Dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Ferruginous Sandstone

Arenite with Hematite/Limonite cement

Chert (specifically Pink/Tan Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (specifically Red Sandstone)

Arenite (SiO2 with Iron Oxide)

Chert (with Quartz Veining)

Microcrystalline Quartz (SiO2)

Ammonite Fossil

Ammonoidea (subclass)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Dendritic Limestone

Calcite with Manganese Oxide (Manganese Dendrites)

Sandstone (Red)

Arenite (primarily SiO2 with Iron Oxide staining)

Chert (Jasper variety)

Chert (SiO2)

Coal (specifically Bituminous or Anthracite)

Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Limonite (Iron-rich Siltstone / Sandstone base)

Hydrous ferric oxide mixture (FeO(OH)·nH2O)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Ammonite Fossil

Ammonoidea (subclass)

Ironstone (likely siderite or goethite-rich siltstone)

Ferruginous Siltstone

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Microcrystalline Quartz (SiO2)

Chert Nodule

Microcrystalline Silica (SiO2)

Sandstone

Arenite (primarily SiO2)

Conglomerate

Conglomerate (Rock composed predominantly of rounded clasts > 2mm)

Chert (Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Limestone

Calcium Carbonate (CaCO3)

Chert (and/or Flint)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (with differential weathering)

Arenite / Quartz Sandstone (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Chert (specifically Flint or Gray Chert)

Silicon Dioxide (SiO2)

Sandstone (specifically an Iron-Concretion)

Arenite with Iron Oxide (Limonite/Goethite) cementation

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone

Chert (Agatized)

Silicon dioxide (SiO2)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Carnelian

Carnelian (SiO2 variant)