Organic Structure (Not A Rock)

Sandstone (with potential fossil inclusions)

Clastic sedimentary rock (primarily SiO2)

Fossiliferous Shale

Laminated Mudrock with plant fossils

Limestone (Fossiliferous)

Calcium Carbonate (CaCO3) - Bioclastic Limestone

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Shale

Mudstone (composed primarily of clay minerals like kaolinite, illite, and smectite, with quartz and calcite)

Fossil Coral (Honeycomb Coral)

Favosites (extinct genus of Tabulate coral)

Chert (Yellow/Tan Variety)

Chert (SiO2)

Chert (specifically Red Chert or Jasper)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Chert (Microcrystalline or cryptocrystalline Silica, SiO2)

Chert (concretionary/nodular variant)

Microcrystalline Quartz (SiO2) with possible fossil or mineral inclusions

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert (varietal: Flint/Jasper mix)

Hydrous Silica (SiO2)

Chert (specifically Flint or Dark Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Shale or Slaty Mudstone

Argillaceous sedimentary rock

Fossilized Shell in Limestone

Bivalve fossil (CaCO3) in Carbonate Sedimentary Rock

Ruby in Fuchsite

Corundum (Al2O3) in Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Lignite (Brown Coal)

Humic Lignite (Carbonaceous sedimentary rock)

Petrified Wood

Silicified Wood (SiO2)

Bituminous Coal

Organic sedimentary rock (humic coal)

Herkimer Diamond

Quartz (Silica - SiO2)

Bituminous Coal

Organic Sedimentary Rock (Carbon-based)

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Bituminous Coal

Bituminous coal (Organic Sedimentary Rock)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)

Coal (Bituminous or Anthracite)

Carbonaceous sedimentary rock (primarily Carbon, C)

Dyed Pink Quartzite (Jadeite Simulant)

Silicon Dioxide (SiO2) with organic dye

Fossilized Dinosaur Skull (Tyrannosaurus rex)

Tyrannosaurus rex (permineralized fossil), rich in Hydroxylapatite/Silica

Puddingstone (Jasper Conglomerate)

Conglomerate (specific type: Jasper Conglomerate or Hertfordshire Puddingstone)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Jasper

Silicon dioxide (SiO2)

Black Jasper (Black Onyx substitute)

Silicon Dioxide (SiO2) with carbonaceous impurities

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

Glauconitic Sandstone

Glauconitic Sandstone with high Glauconite concentration ((K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Basaltic Tuff / Volcanic Breccia

Pyroclastic Breccia / Lithic Tuff

Fossil Shell Fragment (possibly Brachiopod or Bivalve)

Calcium Carbonate (CaCO3) - Phylum Brachiopoda or Mollusca