Sedimentary (Chemically Precipitated Mineral)

Banded Sandstone (Liesegang Rings)

Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)

Dolomite on Prehnite (Saddle-shaped Dolomite)

Dolomite [CaMg(CO3)2] on Prehnite [Ca2Al(AlSi3O10)(OH)2]

Blue Calcite

Calcium Carbonate (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Yellow Ocher (Limonite)

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

Orange Calcite

Calcium Carbonate (CaCO3)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Moqui Marble

Ironstone Concretion (Goethite/Hematite)

Green Calcite

Calcite (Calcium Carbonate, CaCO3)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Limonite (Iron Ore/Bog Iron)

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

White Quartz Pebble

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert with Iron Staining

Microcrystalline Quartz (SiO2)

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Psilomelane (Black Hematite/Manganese Ore)

Barium Manganese Oxide (Formula: BaMn9O18(OH)4)

Oolitic Chert

Silicon Dioxide (SiO2) with oolitic texture

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Chert

Silicon dioxide (SiO2)

Sandstone Cobble with Liesegang Rings

Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)

Jasper with Quartz inclusion

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Tufa

Calcareous Tufa (CaCO3)

Chert (with Manganese Dendrites)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (and Flint)

Silicon Dioxide (SiO2)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Chert

Microcrystalline silica (SiO2)

Jasper (specifically Bloodstone or Heliotrope variety)

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Black Chert)

Microcrystalline Silica (SiO2)

Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)

Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Chert (White Variety)

Silicon Dioxide (SiO2)

Chert (Red Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper/Quartzite river pebble)

Microcrystalline Silica (SiO2)

Jasper with Quartz Veining

Silicon Dioxide (SiO2) - Opaque cryptocrystalline variety of Quartz

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Quartz Geode

Silicon Dioxide (SiO2) in Geode form

Banded Iron Formation (BIF)

Magnetite-hematite-chert formation

Celadonite in Basalt (Green Earth)

Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)

Chert (Light Grey / Flint variant)

Cryptocrystalline Quartz (SiO2)

Chert (Quartzite-rich River Pebble)

Silicon Dioxide (SiO2)

Chert (Common Variety, Jasper)

Microcrystalline Quartz (SiO2)