Sedimentary (Man Made Composite)

Chert

Chert (microcrystalline quartz)

Chert (River Pebble)

Chert (Microcrystalline Quartz, SiO2)

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tufa

Calcareous Tufa (Calcium Carbonate, CaCO3)

Chert (Quartz Pebble)

Silicon Dioxide (SiO2)

Dalmatian Stone

Dalmatian Jasper (Aphanitic Igneous Rock with Arfvedsonite inclusions)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Laterite

Laterite (no specific mineral formula as it's a rock type)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (Nodular or Fossiliferous)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Quartz Variety)

Chert (Silicon Dioxide, SiO2)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified wood (Quartz/Chalcedony - SiO2)

Septarian Nodule

Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Ironstone Concretion / Goethite Nodules

Ironstone (composed primarily of Goethite FeO(OH) and Limonite)

Siltstone

Siltstone (primarily composed of SiO2, Al2O3, and phyllosilicates)

Red Ochre (Hematite-rich Clay)

Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)

Yellow Jasper

Chalcedony (SiO2) with goethite or limonite inclusions

Limonite (Iron Ore)

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

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Red Sandstone

Clastic sedimentary rock (primarily Quartz and Feldspar with Iron Oxide cement)

Red Sandstone

Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)

Red Hematite

Iron(III) oxide (Fe2O3)

Crinoid Stem Columns (Fossil)

Crinoidea (Class); often composed of the mineral Calcite (CaCO3)

Ferruginous Sandstone

Sandstone (rich in iron oxides/hydroxides)

Red Jasper (Jasper)

Silicon Dioxide (SiO₂)

Siltstone

Siltstone (primarily composed of microcrystalline Quartz and Feldspar)

Siltstone with Quartz Vein

Siltstone (primarily SiO2, Al2O3, Fe2O3)

Fossil Sand Dollar (Echinoidea)

Phylum Echinodermata, Class Echinoidea (likely Dendraster or Scutella)

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Chert / Flint

Cryptocrystalline Quartz (Silicon Dioxide, SiO2)

Fossiliferous Limestone (Chertified Limestone)

Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Coquina / Fossiliferous Limestone

Fossiliferous Calcarenite (Calcium carbonate, CaCO3)