Fossilized Tooth Fragment
Vertebrate Fossil (Mammalia indet.)
fossil
Category
Sedimentary Or Mineral
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Bivalve Fossil (Shell-bearing Sedimentary Rock)
Class Bivalvia (Phylum Mollusca) within a Calcarenite/Sandstone matrix
fossil
Cleavable Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Optical Calcite
Calcium Carbonate (CaCO3)
mineral
Geode or Concretion
Silica-filled nodule (likely SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO2) within a geode
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Ironstone Concretion)
Limonite (FeO(OH)·nH2O)
mineral
Sandstone or Quartzite
Arenite (if sedimentary) / Quartzite (if metamorphic)
Sedimentary or Metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Foliated Metamorphic Rock (likely Gneiss or Schist)
Gneissic Metamorphic Rock
metamorphic
Shale
Shale
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Red Sandstone
Arenite (primarily SiO2 with Fe2O3)
sedimentary
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
mineral
Raw Fluorite
Calcium Fluoride (CaF2)
mineral
Devil's Toenail (Fossil Oyster)
Gryphaea arcuata (Calcium Carbonate, CaCO3)
sedimentary
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
sedimentary
Yellow Ochre (Limonite)
Limonite (FeO(OH)qnH2O)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Sulfur (on Matrix)
Native Sulfur (S8)
mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Quartz Geode
SiO2 (Silicon Dioxide)
sedimentary
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Fossilized Shell Fragment
Bivalvia or Gastropoda (Class) fragment
fossil
Quartz in Limonite-rich Matrix
Silicon Dioxide (SiO2) with Goethite/Limonite FeO(OH)·nH2O
Mineral in Sedimentary/Secondary host
Sandstone (likely Graywacke or Lithic Arenite)
Clastic sedimentary rock predominantly composed of silicate grains
sedimentary
Gneiss (River Cobble)
Gneiss
metamorphic
Goethite/Hematite Nodule
Goethite (FeO(OH)) and Hematite (Fe2O3)
mineral
Limonite (with Goethite/Hematite glaze)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite/Hematite Ironstone
Goethite-rich Ironstone (FeO(OH) · nH2O)
sedimentary
Druzy Quartz on Ironstone
Silicon Dioxide (SiO2) on Limonitic Ironstone
mineral
Spinosaurus fossil (permineralized bone)
Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)
sedimentary
Sandstone (with potential iron mineralization)
Arenite
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Magnetite Ore
Magnetite (Fe3O4)
mineral