Sedimentary (Alluvial Deposit)

Tree Agate

Silicon Dioxide (SiO2) with Chlorite/Manganese inclusions

Picture Jasper

Silicon Dioxide (SiO2) with impurities

Sandstone

Arenite (primarily Quartz, SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chalk (Sedimentary Limestone)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Greywacke (River Slikenside)

Greywacke (Lithic Sandstone)

Fuchsite Schist

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2) in Schist

Pyrite

Iron Sulfide (FeS2)

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

Septarian Nodule (Dragon Stone)

Septarian concretion (Complex of Calcite, Aragonite, and Limestone/Clay)

Ironstone (likely Ferruginous Siltstone/Sandstone)

Ferruginous sedimentary rock (FeOx-rich clastic)

Crinoid Stem Fossil

Class Crinoidea (Phylum Echinodermata), often preserved in Limestone or Calcite (CaCO3)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (and its variety Flint)

Silicon Dioxide (SiO2) - Microcrystalline or cryptocrystalline Quartz

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper

Jasper (Silicon Dioxide, SiO2)

Anthracite Coal

Anthracite (Carbon-rich metamorphic coal)

Shale

Shale (clastic sedimentary rock)

Chert (with Quartz vein)

Chert (Silicon Dioxide, SiO2)

Glauconitic Sandstone (or Greensand)

Glauconitic Siliciclastic Rock (Containing (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (with Chalky Cortex)

Silicon Dioxide (SiO2)

Ferruginous Sandstone

Sandstone with iron oxide (Hematite/Limonite) cement

Orange Calcite Sphere

Calcium Carbonate (CaCO3)

Hematite (Iron Ore)

Hematite (Fe2O3)

Carnelian Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Orange Satin Spar (Satin Spar Selenite)

Satin Spar - Hydrous Calcium Sulfate (CaSO4·2H2O)

Carnelian

Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Quartz Geode (partially formed)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (often referred to as Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert Nodule (River Cobble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ferruginous Sandstone (Gozzanous)

SiO2 (Quartz) with FeO(OH) (Goethite) or Fe2O3 (Hematite) coating

Limestone with Weathering Rind

Calcium Carbonate (CaCO3) - Bioclastic or Micritic Limestone

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Mookaite Jasper

Radiolarite (Silicon Dioxide, SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)