Ironstone (Limonite/Hematite)
Ferruginous Sedimentary Rock (composed largely of Fe2O3 and FeO(OH)·nH2O)
sedimentary
Category
Organic Specimen (Fossil)
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Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Hematite/Limonite oxides)
sedimentary
Sandstone (with Possible Iron Staining/Crust)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Limestone
Sedimentary carbonate rock (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone (Old Red Sandstone)
Ferruginous Sandstone (SiO2 + Fe2O3)
sedimentary
Concretion or Geode (unbroken)
Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.
Sedimentary rock (specifically a concretion or possibly a geode)
Shale
Shale (clastic sedimentary rock composed of silt and clay-sized particles)
sedimentary
Sandstone
Arenite (primarily Quartz Arenite)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fossilized Coral (Favosites)
Favosites (Extinct Tabulate Coral)
sedimentary
Fossilized Limestone with Crinoid Stem
Carboniferous Limestone (containing Crinoidea ossicles)
fossil
Crinoid Columnal Fossil in Chert
Crinoidea stemming section in Microcrystalline Quartz (SiO2)
fossil
Fossiliferous Limestone with Brachiopod
Phylum Brachiopoda in Sedimentary Matrix (CaCO3)
fossil
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Shale
Lutaceous Rock (Hydrous Aluminum Silicates)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium carbonate (CaCO3)
sedimentary
Red Sandstone
Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone with Iron Oxide Staining
Arenite with Limonite/Hematite alteration
sedimentary
Sandstone (likely Arkosic)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (SiO2 based)
sedimentary
Weathered chert or flint
Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from photo
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossil Coral (Favosites)
Favosites sp. (Extinct Tabulate Coral)
fossil
Sandstone
Sandstone (Arenite)
sedimentary
Sandstone
Arenite (SiO2 based typically)
sedimentary
Limestone Cobble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Mixed Gemstone and Mineral Collection
Silicon Dioxide (SiO2) based minerals and others
mineral
Shale
Fissile mudrock (composed of clay-sized particles and detrital grains)
sedimentary
Polished amber
Amber (fossilized plant resin), commonly succinite; organic mineraloid rather than a true mineral
gemstone
Weathered sandstone or quartz-rich sedimentary pebble
Indeterminate lithic fragment; likely quartz arenite (sandstone)
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossilized Shark Tooth (Fragment)
Elasmobranchii gen. et sp. indet.
fossil
Fossilized Tabulate Coral in Sandstone/Limestone
Favosites (Order: Tabulata)
fossil
Crinoid Marble
Crinoidal Limestone/Marble
fossil
Fossilized Coral (Favosites)
Favosites goldfussi
fossil
Crinoid Stem Fossil
Crinoidea (Class)
fossil
Petoskey Stone (Weathered/Rough Form)
Hexagonaria percarinata
fossil