Sedimentary (Chemically Precipitated Mineral)

Quartz Geode (Cracked)

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Celestite (Celestine) Geode

Strontium Sulfate (SrSO4)

Magnetite

Iron(II,III) oxide (Fe3O4)

Pyrite

Iron Disulfide (FeS2)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Granitic Gneiss

Gneiss (Metamorphic Rock)

Sandstone

Arenite (composed mainly of SiO2)

Geode (unopened)

Silica-filled Concretion (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Shale

Shale (Sedimentary rock composed of mud/clay minerals)

Sandstone with Magnetite and Iron Staining

Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)

Sandstone

Arenite

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Dalmatian Stone

Peralkaline rhyolite

Hag Stone

Perforated Sedimentary Rock

Sandstone

Arenite (Sedimentary Rock)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Pyrite

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Limestone Breccia

Sedimentary Breccia (Calcareous)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Gneiss

Gneiss (Metamorphic rock)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Sandstone

Arenite (SiO2 principal component)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Sandstone

Arenite

Sandstone (likely Calcareous or Micaceous)

Clastic sedimentary rock (primarily Quartz with Cementing Agents)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2)

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Blue Kyanite

Kyanite (Al2SiO5)

Satin Spar (Gypsum)

Hydrous calcium sulfate (CaSO4·2H2O)