Organic (Mineraloid)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Coprolite

Coprolite

Sandstone (with potential trace fossils)

Clastic sedimentary rock (primarily SiO2)

Fossilized Coral (Petoskey Stone / Favosites)

Favosites (extinct genus of tabulate coral)

Limestone Pebble

Sedimentary Calcium Carbonate (CaCO3)

Limestone Cobble

Sedimentary Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Fossiliferous Calclutite / Bio-calcarenite (CaCO3)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Banded Sandstone (Hag Stone)

Arenite Sandstone (SiO2 with impurities)

Fossiliferous Limestone (with Coralline Inclusions)

Calcium Carbonate (CaCO3)

Greenstone (Epidote/Chlorite-rich Metabasalt)

Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))

Fossiliferous Limestone

Biogenic Calcium Carbonate (CaCO3)

Coral Fossil (Favosites)

Favosites (Extinct genus of tabulate corals)

Bryozoan Fossil

Phylum Bryozoa (commonly known as 'moss animals')

Limestone

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Aragonite

Aragonite (Carbonate mineral), CaCO3

Chert Nodule

Microcrystalline Quartz (SiO2)

Piddock bored rock (Boring Stone)

Ichnofossil-bearing Limestone or Mudstone (trace fossils by Pholadidae)

Sandstone with Liesegang Rings

Arenite with secondary Iron oxide (Limonite/Goethite) precipitation

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Banded Iron Formation (BIF)

Banded Iron Formation containing Hematite (Fe2O3) and Magnetite (Fe3O4)

Chert (Common Opal/Agate inclusion)

Microcrystalline Quartz (SiO2)

Travertine (Tufa)

Chemical Sedimentary Limestone (CaCO3)

Limestone (Flagstone)

Fossiliferous Limestone (CaCO3)

Fossiliferous Limestone

Calcium Carbonate (CaCO3) with Bioclastic Inclusions

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Fossilized Coral (Petoskey-like or Favosites)

Anthozoa (Fossilized Coral)

Sandstone with Trace Fossils

Arenite with Ichnofossils

Chalk

CaCO3 (primarily Calcium Carbonate), biogenic sedimentary rock

Sandstone (with Lichen)

Arenite (primarily SiO2)

Pearl (as a biogenic mineral/gemstone)

Calcium Carbonate (mostly Aragonite), CaCO3

Shale with Siltstone layering

Sedimentary Clastic Rock (Mudstone/Shale)

Fossilized Favosites (Honeycomb Coral)

Favosites (Genus), Phylum Cnidaria, Class Anthozoa

Shale

Fissile Mudstone (primarily composed of phyllosilicate minerals like kaolinite, montmorillonite, and illite)

Pumice

Pumice (Vesicular Rhyolite/Andesite)

Chert

Siliceous sedimentary rock (predominantly microcrystalline quartz, SiO2)

Sugilite

Sugilite (KNa2(Fe,Mn,Al)2Li3Si12O30)

Fossiliferous Limestone

Sedimentary Calcium Carbonate (CaCO3)

Fossiliferous Limestone

Limestone with fossil inclusions (CaCO3)