Sandstone (with Iron Staining)
Arenite (Silicon Dioxide, SiO2, often with iron oxides like Limonite)
sedimentary
Category
Organic Specimen (Fossil)
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Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide staining/cementing)
sedimentary
Fossilized Coral (Honeycomb Coral)
Favosites (extinct genus of tabulate corals), CaCO3 (Calcium Carbonate)
sedimentary
Favosites Fossil (Honeycomb Coral)
Favosites (Order Favositida)
sedimentary
Fossilized Oyster (Gryphaea or Exogyra)
Crassostrea / Gryphaea (Bivalvia)
sedimentary
Brachiopod Fossil in Matrix
Phylum Brachiopoda
fossil
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
sedimentary
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Hand-Drawn Gengar Pokémon Card Artist Item
Lignocellulosic Fiber (Cellulose, C6H10O5) with wax-based pigment (crayon/colored pencil)
Organic (Paper and Cellulose)
Sandstone
Clastic Sedimentary Rock (primarily Quartz, SiO2)
sedimentary
Ferruginous Sandstone (Gritstone)
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3 and FeO(OH))
sedimentary
Amber
Succinite (fossilized resin)
mineral
Sandstone
Arenite
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert Nodule (Commonly known as a Flint or River Cobble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Red Mudstone (Siltstone)
Lutite (primarily Quartz and Clay minerals with Hematite)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Iron Oxide coating)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert (with Fossiliferous Silicification)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide)
sedimentary
Limestone
CaCO3 (principally composed of Calcite)
sedimentary
Ferruginous Sandstone (with Laterite)
Ferruginous Arenite (FeO(OH)·nH2O)
sedimentary
Fossil Coral / Petrifed Coral Agate
Silicified Anthozoa (Agatized Coral)
fossil
Jasper with Dendritic Inclusions
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Dendritic Agate (Tumbled)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Bivalve Fossil (Clam)
Class Bivalvia (e.g., Mercenaria or similar genus)
fossil
Obsidian and Fossilized Shark Tooth
Obsidian (Volcanic Glass) and Otodus sp. (Fossilized shark tooth)
igneous and fossil
Rugose Coral (Horn Coral)
Order Rugosa (extinct fossilized coral)
sedimentary
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Sandstone (River Stone)
Arenite (composed primarily of SiO2)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Note: Item is not a geological specimen
Homo sapiens (Dermal Appendage: Pilus)
Organic / Biological
Limestone (Riprap)
Calcium Carbonate (CaCO3)
sedimentary
Echinoid Fossil / Fossilized Sea Urchin
Echinoidea
fossil
Sandstone / Limestone
Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary