Sedimentary

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Chert / Flint

Microcrystalline Quartz (SiO2)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Petrified Wood

Silicified Wood (primarily SiO2)

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Chert (White/Gray variety)

Chert (SiO2)

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Chert (Jasper/Iron-stained Quartzite)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Novaculite Variety)

Microcrystalline Quartz (SiO2)

Oolite or Oolitic Limestone

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Sandstone (with garnet granules)

Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3 iron oxide staining)

Chert

Chert (SiO2)

Ferruginous Sandstone (Gozzan/Ironstone)

Arenite with Limonite/Goethite cement (FeO(OH)·nH2O)

Limestone

Calcium carbonate (CaCO3)

Shale

Argillaceous Rock

Sandstone

Arenite (SiO2 based with various mineral cements)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (primarily SiO2)

Sandstone (Micaceous/Feldspathic variant)

Arenite (specifically subarkose or lithic arenite)

Limestone

Calcareous sedimentary rock (primarily Calcium Carbonate, CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Sandstone

Arenite (primarily SiO2)

Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

Shale with Iron Oxide Staining

Fissile Mudstone (primarily clay minerals and quartz)

Limestone

Calcium Carbonate (CaCO3)

Sandstone

Arenite

Red Mudstone (Siltstone)

Lutite (primarily Quartz and Clay minerals with Hematite)

Sandstone

Arenite (primarily SiO2)

Limestone

Calcium Carbonate (CaCO3)

Sandstone Beach Pebble

Clastic sedimentary rock (SiO2 with iron oxide cement)