Man Made Composite (Lithified Equivalent Of Sedimentary)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide staining/cementing)

Jasper or Chert

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF) / Tiger Iron variety

Banded Iron Formation (composed primarily of Magnetite Fe3O4, Hematite Fe2O3, and Chert/Quartz SiO2)

Chert (specifically a Worked Flint/Knapped Flake)

Chert / Flint (Microcrystalline Quartz, SiO2)

Greywacke

Greywacke (Lithofeldspathic Sandstone)

Chert (specifically Flint or Common Chert)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Red Jasper (Brecciated or Mottled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Nodule)

Microcrystalline Silica (SiO2)

Chert (and/or Flint)

Silicon Dioxide (SiO2)

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3 with a sandstone core)

Chert (Lake Superior Agate variant)

Microcrystalline Quartz (SiO2)

Druzy Quartz (on Quartzite or Chert)

Silicon Dioxide (SiO2)

Chert (often called Flint for dark varieties)

Chert (SiO2)

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Tufa (Vesicular Limestone)

Tufa (form of Calcium Carbonate, CaCO3)

Chert / Flint (with quartz or calcite inclusion)

Silicon dioxide (SiO2)

Quartz Geode (Cracked Open)

Quartz (Silicon Dioxide - SiO2)

Chert (Cherty Limestone / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert

Chert (Microcrystalline Silica, SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Travertine (Calcareous Tufa)

Calcium Carbonate (CaCO3)

Chert (Flint)

Chert (Cryptocrystalline variety of Quartz, SiO2)

Chert (often called Flint in this variation)

Silicon dioxide (SiO2) - Microcrystalline quartz

Fossiliferous Limestone (with Crinoids)

CaCO3 (Calcium Carbonate)

Aragonite Star Cluster

Aragonite (Sputnik habit) - CaesarCO3

Orange Calcite

Calcite (Calcium Carbonate - CaCO3)

Marble

Metamorphosed Limestone (calcite formulation CaCO3)

Quartz (Tumbled/Polished Pebble)

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Hematite

Iron(III) oxide (Fe2O3)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Fluorite (Rainbow Fluorite)

Calcium Fluoride (CaF2)

Bauxite

Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)

Blue Chalcedony Geode (with Quartz Druzy)

Silicon Dioxide (SiO2) - Microcrystalline variety of Quartz

Limonite (Iron Stone Concretion)

Limonite (Hydrous Iron Oxide) - FeO(OH)·nH2O

River Stone (Chert/Siltstone)

Cryptocrystalline Quartz (SiO2) with trace impurities