Sedimentary (Imitation)

Conglomerate (Puddingstone)

Conglomerate (specifically, clastic sedimentary rock)

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Limestone (specifically a Crushed Aggregate fragment)

Calcium Carbonate (CaCO3)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Sandstone (likely Quartz Sandstone)

Arenite (composed primarily of SiO2)

Dalmation Stone (often called Dalmatian Jasper)

Peralkaline Rock (Microgranite/Aplite), SiO2 with inclusions of Arfvedsonite

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite

Chert (Flint)

Silicon Dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Fossil Bivalve Shell

Class Bivalvia (e.g., Veneriidae family)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Sandstone (Quartzose type)

Arenite (primarily SiO2)

Sandstone

Arenite (composed mainly of SiO2)

Sandstone (likely Quartzose Sandstone with mineral staining)

Arenite (composed mainly of SiO2)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Reddish Brown Claystone or Siltstone

Argillite / Siltstone / Claystone

Dendritic Agate or Manganese Nodule in Chert/Limestone

Silicon Dioxide (SiO2) with Manganese Oxide (MnO2) inclusions

Red Jasper (River Stone)

Jasper (Silicon Dioxide, SiO2 plus iron oxide inclusions)

Blue Chalcedony

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Blue Chalcedony

Chalcedony (Silicon Dioxide, SiO2)

Sandstone (Micaceous)

Arenite (primarily SiO2 with Phyllosilicates)

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

Sandstone (Red)

Arenite (Fe2O3 heavy)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (SiO2 based)

Sandstone (Painted)

Arenite (primarily SiO2)

Chert (often called Flint)

Chert (Cryptocrystalline Quartz, SiO2)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 + varied clasts)

Piddock bored rock (likely Mudstone or Shale)

Ichnofossil (Gastrochaenolites borings) in Fine-grained Sedimentary Rock

Quartz

Quartz (SiO2 - Silicon Dioxide)

Conglomerate

Conglomerate (clastic sedimentary rock)

Sandstone

Arenite or Sandstone

Celestite (Celestine) Geode

Strontium Sulfate (SrSO4)

Jasper, Agate, Quartz Mix (Polished Beads)

SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.