Sandstone
Arenite (primarily SiO2)
sedimentary
Category
Organic Specimen (Fossil)
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Sandstone (likely Quartzose)
Sandstone (Principally SiO2)
sedimentary
Trilobite Pygidium (Tail Segment)
Phylum Arthropoda, Class Trilobita (likely order Phacopida)
sedimentary (fossil)
Stromatolite
Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limestone
Calcareous sedimentary rock (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Shale
Argillaceous Rock
sedimentary
Sandstone
Sandstone (clastic sedimentary rock), primarily SiO2
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata (Fossilized colonial rugose coral)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Amber (Sumatran / Indonesian Red Blue)
Succinum (Fossilized Tree Resin)
fossil
Crinoid Stem Fossil
Class Crinoidea (Phylum Echinodermata), primarily Calcium Carbonate (CaCO3)
sedimentary
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone (Red/Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone (likely Quartzose Sandstone)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized colonial coral)
sedimentary
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Cone-in-cone structure
Cone-in-cone structure
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Honeycomb Coral Fossil (Favosites)
Favosites (Order Tabulata)
fossil
Petoskey Stone (Fossilized Coral)
Hexagonaria percarinata
fossil
Chert (Black Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion (SiO2 + FeO(OH))
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Nodular)
Cryptocrystalline Quartz (SiO2)
sedimentary
Dendritic Agate (specifically Orange/Tumbled)
Silicon Dioxide (SiO2) with Oxide Inclusions
mineral
Coral Fossil / Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Shale (or Mudstone)
Laminose Mudrock (composition: clay minerals, quartz, and mica flakes)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Limestone (with possible Manganese oxide inclusions)
Sedimentary Calcium Carbonate (CaCO3)
sedimentary