Sandstone
Sedimentary Rock (Quartz arenite)
sedimentary
Category
Organic Specimen (Fossil)
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Sandstone
Sedimentary Rock (Quartz arenite / Lithic sandstone)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Concretion
Calcareous or ferruginous concretion
sedimentary
Fossilized Shark Tooth (Scapanorhynchus)
Scapanorhynchus texanus
fossil
Ironstone Concretion / Limonite Node
Goethite / Limonite (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Agatized Coral (Petrified Coral)
Agatized Fossil Coral (Silicon Dioxide, SiO2 replacement after Anthozoa)
fossil
Petoskey Stone
Hexagonaria percarinata
fossil
Crinoid Stem Fossil
Crinoid Columnal (Phylum Echinodermata)
fossil
Sandstone
Sandstone (SiO2 dominant, with minor feldspar and clay minerals)
sedimentary
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Sandstone (with Limonite staining)
Arenite (FeOx-rich)
sedimentary
Sandstone (likely Graywacke or Arkose)
Clastic Sedimentary Rock (primarily SiO2 with various lithic fragments)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone (Crinoidal Limestone)
Calcium Carbonate with Crinoid Stem Fossils (CaCO3)
sedimentary
Claystone / Mudstone
Mudstone (Hydrous aluminum silicate rich rock)
sedimentary
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil
Fossilized Blastoid
Pentremites (Class Blastoidea)
sedimentary
Sandstone
Sandstone (clastic sedimentary rock, predominantly SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Fossilized Sea Urchin (Echinoid)
Echinoidea (Class); commonly Clypeasteroida for sand dollar types
sedimentary (fossil)
Weathered sandstone or arkosic sandstone
Clastic sandstone, likely quartz–feldspar-rich (arkose)
sedimentary
Siltstone with Concretion
Siltstone (composed of hydraulic silicates and quartz particles)
sedimentary
Sandstone (River Pebble)
Clastic Sedimentary Rock (primarily Quartzite/Arenite)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods), mineralized as Calcite (CaCO3) in Fossiliferous Limestone
sedimentary
Sandstone (Red Arkose)
Sandstone (Arkose variant, primarily SiO2 with KAlSi3O8)
sedimentary
Sandstone
Arenite
sedimentary
Polished Ocean Jasper (orbicular jasper)
Siliceous microcrystalline quartz/chalcedony, mainly SiO₂, with iron- and manganese-rich inclusions
sedimentary
Sandstone (Ferruginous)
Arenite (SiO2 with Fe2O3 inclusions)
sedimentary
Sandstone (likely Quartzose type)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Coquina (Fossiliferous Limestone)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert (Basanite / Jasperoid)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Weathered quartz-rich rock, possibly granite or quartzite
Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss
igneous
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Sandstone
Arenite (specifically Quartz Arenite)
sedimentary
Petoskey Stone
Hexagonaria percarinata
fossil