Sedimentary (If Natural Jasper) Or Artificial (If Slag)

Sandstone (with Concretion)

Arenite / Quartzose Sandstone

Sandstone (Red Sandstone / River Stone)

Arenite (composed primarily of Quartz, SiO2, with Iron Oxide cementation)

Quartz-veined Schist (or Metasandstone)

Metamorphic Rock with Quartz Veining (SiO2)

Garnet Schist

Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)

Pyrite

Iron Sulfide (FeS2)

Ferruginous Quartz (Agatized/Iron-stained Quartzite)

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Red Coral (with Hematite and Black Pearl accents)

Corallium rubrum (Calcium Carbonate, CaCO3)

Sandstone (with Lichen)

Arenite (composed primarily of SiO2)

Sandstone (Pebble)

Arenite (primarily SiO2)

Ironstone Concretion (Moqui Marble)

Iron Oxide Concretion (Goethite and Hematite around a Sandstone core)

Orange Calcite (Cleavage Rhomb)

Calcite (Calcium Carbonate, CaCO3)

Ferruginous Sandstone

Clastic sedimentary rock (SiO2 with Fe2O3/FeO(OH) cement)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Sandstone (Quartzite Pebble)

Arenite (primarily SiO2)

Chert / Flint

Silicon dioxide (SiO2)

Jasper in Quartzite (likely Cinnabar or Iron inclusions)

Silicon dioxide (SiO2) with impurities

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 principal composition)

Sandstone

Arenite (primarily SiO2)

Chert (Iron-stained)

Chert (Cryptocrystalline Silica, SiO2)

Agate (Crazy Lace or Eye Agate)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Glauconitic Sandstone

Glauconitic Quartz-Wacke / Sandstone (Fe(II),Fe(III),Al,Mg)2-3(Si,Al)4O10(OH)2

Siltstone

Siltstone (primarily composed of SiO2 with various clay minerals)

Sandstone (Greywacke)

Clastic Sedimentary Rock (SiO2 with lithic fragments)

Iron Ore (Hematite/Magnetite mixture)

Ferrous Oxide (Fe2O3 / Fe3O4)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Diamond (or Lab-Grown Cubic Zirconia)

Carbon (C)

Yellow Calcite

Calcium Carbonate (CaCO3)

Gastropod Fossil (Snail Steinkern)

Class Gastropoda fossil, composed of Calcium Carbonate (CaCO3)

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Amber

Organic gemstone (Succinite is common if from the Baltic)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Wishing Stone (Sandstone with Quartz Vein)

Arenite with Quartzite intrusion (SiO₂)

Gold Nugget

Native Gold (Au)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Coquina / Fossiliferous Limestone

Bioclastic Limestone (CaCO3)

Quartz River Cobble (Yellow Jasper/Quartzite variant)

Quartzite (primarily Silicon Dioxide, SiO2)