Sedimentary (Artificial)

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)

Ironstone concretion / Limonitic Sandstone

Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)

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)

Anthracite Coal

Anthracite (Carbon based)

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Chert / Flint

Microcrystalline Quartz (SiO2)

Polygenetic Conglomerate (Puddingstone)

Conglomerate (SiO2 matrix with mixed clasts)

Petrified Wood

Silicified Wood (primarily SiO2)

Ironstone Concretion (Limonite/Goethite)

Ironstone (primarily FeO(OH)·nH2O)

Chert (White/Gray variety)

Chert (SiO2)

Jasper (specifically a banded or dark variety)

Silicon Dioxide (SiO2) with impurities

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Chert (Jasper/Iron-stained Quartzite)

Silicon Dioxide (SiO2)

Chert (and/or Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (specifically Flint or Gray Chalcedony)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Banded Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Chert (Novaculite Variety)

Microcrystalline Quartz (SiO2)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Oolite or Oolitic Limestone

Oolitic Limestone (Principal mineral: Calcite, CaCO3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert with Asphaltum (or Tar)

Silica (SiO2) with natural Bitumen/Asphaltum

Pyrite

Iron Sulfide (FeS2)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Pyrite

Iron Pyrite (FeS2)

Chert

Chert (SiO2)

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Banded Sandstone (Wonderstone)

Sandstone with Liesegang Rings (SiO2 with Iron Oxides)

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Fossilized Gastropod (Snail)

Class Gastropoda (internal mold or 'steinkern')

Chert (Hagstone/Gasket Rock variant)

Chert (SiO2)

Glauconitic Sandstone

Glauconitic arenite (contains (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Ferruginous Sandstone

Arenite with Iron-oxide cement (composed of Quartz and Limonite/Hematite)

Chert (Flint)

Microcrystalline quartz (SiO2)

Fossil Coral (Favosites)

Favosites (Order: Tabulata, Phylum: Cnidaria)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) with impurities such as Fe2O3

Jasper or Agate-bearing Chert

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Limestone-based)

Silicon Dioxide (SiO2)