Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Green Chert

Silicon Dioxide (SiO2)

Polished black-and-white banded stone, likely tourmalinated quartz or zebra jasper

Quartz (SiO₂) with black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄), or quartz-rich zebra jasper

Polished red jasper

Jasper, microcrystalline quartz (SiO₂) colored by iron oxides

Orange Calcite

Calcium Carbonate (CaCO3)

Hag Stone

Perforated sedimentary rock (typically flint, chert, or limestone)

Jasper

Silicon Dioxide (SiO2)

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) with impurities

Limonite / Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O)

Limonite or Ironstone Nodule

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Magnetite / Ironstone Pebble

Magnetite (Fe3O4)

Puddingstone (specifically Michigan/Gowganda Puddingstone)

Conglomerate (Jasper Conglomerate)

Red Jasper

Red Jasper (SiO2)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Red Sandstone

Arenite (Ferruginous Sandstone)

Magnetite (Octahedral Crystal)

Magnetite (Fe3O4)

Magnetite

Magnetite (Fe3O4)

Sandstone (likely Quartzose)

Arenite (primarily SiO2)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Chert (Jasper)

Silicon Dioxide (SiO2)

Sandstone

Clastic Sedimentary Rock

Tumbled jasper or jasper-rich chert

Microcrystalline quartz (SiO₂) with iron-oxide impurities

Limonite (Ochreous Sandstone)

Hydrous ferric oxides (FeO(OH)qnH2O)

Red Jasper

Quartz (SiO2) with hematite inclusions

Yellow Jasper

Silicon Dioxide (SiO2)

Red Jasper

Silicon dioxide (SiO2) with iron oxide inclusions

Likely polished dark stone or glassy mineral bead

Indeterminate; possibly obsidian, hematite, or a dark agate

Sandstone

Clastic Sedimentary Rock

Banded chert or siliceous mudstone

Microcrystalline quartz (chalcedony), SiO₂; possibly ferruginous shale

Jasper / Quartz Pebble

Silicon Dioxide (SiO2) microcrystalline quartz

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper

Silicon Dioxide with Iron inclusions (SiO2 + Fe2O3)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Kambaba Jasper

Stromatolite Jasper (Microcrystalline Quartz)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Pyrite in Matrix

Iron Sulfide (FeS2)

Fluorite and Red Jasper

Fluorite (Calcium Fluoride, CaF2) and Red Jasper (Silicon Dioxide, SiO2)

Red Jasper

Chalcedony/Quartz (SiO2) with iron inclusions

Flint / Chert

Microcrystalline Quartz (SiO2)

Chert / Flint Nodular Fragment

Microcrystalline quartz (SiO2)