Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Category
Sedimentary Or Mineral
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Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Geode (Calcite or Quartz)
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
sedimentary
Blue Chalcedony
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Pyrite in Quartz Matrix
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Argillite / Mudstone
Argillaceous sedimentary rock
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone (Banded)
Clastic Sedimentary Rock: Arenite
sedimentary
Shale
Shale (Fine-grained clastic sedimentary rock)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Shale
Sedimentary rock composed of clay minerals and quartz
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
Fluorite
Calcium Fluoride (CaF2)
mineral
Pyrite cluster (iron pyrite)
Pyrite, FeS₂
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Limonite
FeO(OH)·n(H2O)
mineral
Celestite
Celestine (SrSO4)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Rhodochrosite with Quartz
Manganese Carbonate (MnCO3) with Silicon Dioxide (SiO2)
mineral
Selenite (variety of Gypsum)
Calcium sulfate dihydrate (CaSO4·2H2O)
mineral
Magnetite / Ironstone
Magnetite (Fe3O4)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Weathered Sandstone Cobble
Arenite / Quartz Sandstone
sedimentary
Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
sedimentary
Limonite Geode / Ironstone Nodule
Hydrated Iron Oxide Hydroxide (FeO(OH)·nH2O)
mineral
Sandstone (lithic)
Lithic Wacke / Arenite
sedimentary
Graphite
Graphite (Carbon, C)
mineral
Graphite
Carbon (C)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Fossilized Fish (Lepidotes)
Lepidotes sp. (Order: Lepisosteiformes)
sedimentary
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chalcopyrite
Copper Iron Sulfide (CuFeS2)
mineral