Sedimentary (Anthropogenic)

Pyrite

Iron Sulfide (FeS2)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Pyrite

Iron Pyrite (FeS2)

Chert

Chert (microcrystalline quartz, SiO2)

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Greenstone (Greywacke or Nephrite Jade variant)

Metamorphosed mafic igneous or sedimentary rock (e.g., Actinolite-Chlorite Schist)

Anthracite Coal

Anthracite (Carbon based)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

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)