Marble

Chert (specifically Gray Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (variations include Flint or Jasper)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Fossilized Shark Tooth in Matrix

Otodus sp. (likely Otodus obliquus)

Chert (Nodule)

Silicon Dioxide (SiO2)

Banded Iron Formation (BIF)

Banded Iron Formation

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Ooids (Oolites)

Ooids (composed of Calcium Carbonate / CaCO3)

Chert Pebble

Microcrystalline silica (SiO2)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Satin Spar Selenite

Gypsum (CaSO4·2H2O)

Sandstone

Arenite

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals: (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Green Chert

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Diamond (in Jewelry Setting)

Carbon (C) - Isometric-Hexoctahedral

Limestone

Calcium Carbonate (CaCO3)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Mother of Pearl (Nacre)

Nacre (Aragonite/Conchiolin), CaCO3 + Organic Polymers

Crushed Limestone

Sedimentary Calcium Carbonate (CaCO3)

Chert (variations include Flint or Jasper)

Chert (Silicon Dioxide, SiO2)

Abalone Shell (Mother of Pearl)

Aragonite (Biogenic Calcium Carbonate, CaCO3)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Garnet in Matrix (Eclogite)

Eclogite, featuring Almandine or Pyrope Garnet [X3Y2(SiO4)3]

Chert (Beach Pebble)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Pearl

Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3

Limestone

Calcium Carbonate (CaCO3)

Chert Nodule in Limestone

Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)

Chert (specifically as a lithic artifact/projectile point)

Chert (Silicon dioxide, SiO2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Chert (Cryptocrystalline Quartz, SiO2)

Manganese Ore (Psilomelane/Pyrolusite)

Psilomelane ((Ba,H2O)2Mn5O10) and Pyrolusite (MnO2)

Rough Diamond

Diamond (Native Element Carbon, C)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Olivine (Peridot)

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

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Chalk / Sedimentary Limestone

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Red Chert (Jasper)

Microcrystalline Quartz (SiO2)

Chert (Jasper transition)

Microcrystalline Quartz (SiO2)

Limestone with Bitumen/Chert

Calcite (CaCO3) containing organic hydrocarbons

Diamond (or Cubic Zirconia)

Carbon (C) / Cubic Zirconium Dioxide (ZrO2)