Ferruginous Sandstone (Ironstone)
Ferruginous Sandstone / Limonite-cemented Quartz Sandstone
sedimentary
Category
Organic Specimen (Fossil)
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Dendritic Agate
Silicon Dioxide (SiO2) with Manganese or Iron Oxide inclusions
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Favosites Fossil (Honeycomb Coral)
Favosites alpenensis
fossil
Brachiopod Fossil in Sedimentary Matrix
Phylum Brachiopoda in Siltstone/Mudstone matrix
fossil
Fossil Coral (Petoskey Stone or Chain Coral Pebble)
Hexagonaria percarinata / Rugosa coral (CaCO3)
fossil
Fossilized Shark Tooth
Elasmobranchii (various species, possibly Carcharias or Odontaspis)
fossil
Fossilized Coral
Anthozoa (Fossilized)
Sedimentary / Fossil
Crinaudite / Fossilized Crinoid Stem
Crinoid (Echinodermata) in a Calcitic/Siliceous Matrix
sedimentary
Shale
Argillaceous sedimentary rock
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Mudstone
Argillite / Siliciclastic sedimentary rock
sedimentary
Sandstone
Arenite
sedimentary
Chert nodules
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Slate
Slate
metamorphic
Sandstone
Arenite (specifically Iron-stained Quartz Sandstone)
sedimentary
Chert (with small quartz inclusion)
Microcrystalline Silica (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Ferruginous Sandstone (ironstone)
Sandstone with iron oxide cement (limonite/hematite)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Slate
Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)
metamorphic
Sandstone (likely Arkosic or Lithic Sandstone)
Arenite (SiO2 based with mineral inclusions)
sedimentary
Fossilized Shark Tooth
Elasmobranchii gen. indet.
fossil
Otodus Shark Tooth
Otodus obliquus
fossil
Fossilized Horn Coral
Rugosa
fossil
Limestone or Chalk
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Kambaba Jasper
Stromatolite (fossilized algae)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzwacke / Impure Sandstone
Arenite with minor lithic fragments (Silicon Dioxide matrix)
sedimentary
Fossil Coral (Petoskey Stone / Hexagonaria)
Hexagonaria percarinata (Silicified/Calcite Replacement Coral)
fossil
Fossiliferous Limestone (Crinoid stem fossils)
Sedimentary Limestone with Crinoidea ossicles
fossil
Ammonite Fossil in Matrix
Ammonoidea subclass (e.g., Arietites or similar genera)
fossil
Fossilized Crinoid Stem
Class Crinoidea (Echinodermata)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary Rock (Primarily Calcite: CaCO3)
sedimentary
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2) with impurities
mineral