Marble

Diamond

Carbon (C)

Serpentinite

Serpentinite (complex silicate minerals including Mg3Si2O5(OH)4)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Bivalve Fossil (Clam)

Class Bivalvia (Calcium Carbonate, CaCO3)

Sandstone

Arenite

Chert (Jasper/Flint Pebble)

Microcrystalline quartz (SiO2)

Serpentine

Serpentinite (composed mainly of Group Minerals Antigorite, Chrysotile, and Lizardite; Mg3Si2O5(OH)4)

Mookaite Jasper

Silicified Radiolarite (SiO2 with iron impurities)

Banded Iron Formation (BIF) / Tiger Iron

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

Fossiliferous Limestone

Limestone (Calcium Carbonate, CaCO3)

Chert (River Pebble)

Chert (SiO2)

Fossilized Tiger Shark Tooth

Galeocerdo cuvier (fossilized hydroxylapatite)

Turquoise, Pearl, and Coral Necklace

CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Chert / River Pebble

Silicon Dioxide (SiO2)

Quartz (Beach Pebble)

Quartz (Silicon Dioxide - SiO2)

Fossil Shark Tooth (embedded in matrix)

Lamniformes (likely Cretalamna or Squalicorax) within phosphatic/calcareous matrix

Chert

Microcrystalline Quartz (SiO2)

Limestone

Calcium Carbonate (CaCO3)

Limestone

Calcium Carbonate (CaCO3)

Amber with Organic Inclusions

Succinite (fossilized resin)

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation (predominantly Hematite, Magnetite, and Chert)

Yellow Chert (Chalcedony)

Microcrystalline Quartz (SiO2)

Greenstone / Serpentinite

Serpentinite (composed largely of Serpentine group minerals, Mg3Si2O5(OH)4)

Chert / River Pebble

Cryptocrystalline Quartz (SiO2)

Favosites Fossil (Honeycomb Coral)

Favosites sp. (Extinct genus of tabulate coral)

Red Sandstone

Arenite (Ferruginous Sandstone)

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Limonitic Sandstone with Inclusion

Limonitic Quartz Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Amber (specifically Cherry Amber)

Succinite (with the chemical formula C10H16O)

Chert (with Iron Staining)

Silicon Dioxide (SiO2 / Cryptocrystalline Quartz)

Basalt Pebble

Mafic Igneous Rock (Basalt)

Green Chert

Microcrystalline Quartz (SiO2)

Septarian Nodule

Calcite-bearing Septarian Concretion

White Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Black Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint variety)

Chert (SiO2)

Chert with Calcite Veins

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) intrusions

Chert (and associated Sedimentary rocks)

Microcrystalline Silica (SiO2)

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)