Marble

Crinoid and Coral Fossils in Limestone

Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)

Banded Iron Formation (BIF)

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

Milky Quartz (Water-worn Pebble)

Quartz (Silicon Dioxide) - SiO2

Chert (specifically a weathered Chert nodule or fragment)

Chert; Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert

Silicon dioxide (SiO2)

River Stone (Chert/Siltstone)

Cryptocrystalline Quartz (SiO2) with trace impurities

Fossiliferous Limestone (Coquina / Shell Limestone)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Peridot

Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4

Chert (specifically Flint or Common Chert)

Silicon Dioxide (SiO2)

Chert (Honey Chert or Chalcedony Pebble)

Cryptocrystalline Quartz (SiO2)

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Diamond

Diamond (Pure Carbon, C)

Chert (Jasper/Quartzite river stone)

Microcrystalline Silicon Dioxide (SiO2)

Sandstone (Quartz Arenite)

Sandstone (SiO2 with possible mineral cements)

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

Chert

Chert (SiO2)

Quartz / Limestone Gravel

SiO2 (Silicon Dioxide) and CaCO3 (Calcium Carbonate)

Limestone

Calcareous sedimentary rock (CaCO3)

Diamond

Diamond (pure Carbon, C)

Basalt Water-Worn Pebble

Aphanitic Mafic Igneous Rock

Sandstone (likely Arkosic or Lithic Sandstone)

Clastic Sedimentary Rock (SiO2 with assorted minerals)

Amber

Succinite (C10H16O)

Pyrite

Iron Sulfide (FeS2)

Limestone

Calcium Carbonate (CaCO3)

Chert (and Chert Geode)

Silicon Dioxide (SiO2)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Ironstone (with Limonite/Goethite)

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)

Chert (specifically Gray/Black Chert)

Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Slate

Foliated Metamorphic Rock (composed primarily of Quartz, Muscovite, and Illite)

Basalt (Water-worn Pebble)

Basalt (Mafic volcanic rock)

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Chert (Jasper/Flint variety)

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Coquina / Fossiliferous Limestone

Calcite-rich Bioclastic Sedimentary Rock (CaCO3)

Quartz (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

Chert (specifically Black Chert / Flint)

Silicon Dioxide (SiO2)

Chert (Jasper)

Silicon Dioxide (SiO2)