Marble

Diamond (in a jewelry setting)

Diamond (Carbon, C)

Greywacke

Dirty Sandstone (Lithic wacke)

Zebra Jasper (Zebra Stone)

Tumbled Silicon Dioxide (SiO2) with impurities

Bivalve Fossil (Clam)

Class Bivalvia (Calcium Carbonate, CaCO3)

Chert (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Coquina / Shelly Limestone

Coquina (calcium carbonate, CaCO3)

Chert (specifically Black Chert or Flint)

Cryptocrystalline Quartz (SiO2)

Serpentinite

Serpentinite (complex of Antigorite, Lizardite, and Chrysotile, Mg3Si2O5(OH)4)

Turquoise, Pearl, and Coral Necklace

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

Serpentinite

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

Chert (White Chert)

Microcrystalline Quartz (SiO2)

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)

Chert (variations include Flint/Jasper)

Chert (Silicon Dioxide, SiO2)

Chert (River Pebble)

Chert (SiO2)

Amber with Organic Inclusions

Succinite (fossilized resin)

Quartz (Beach Pebble)

Quartz (Silicon Dioxide - SiO2)

Fossil Shark Tooth (embedded in matrix)

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

Green Chert

Microcrystalline Quartz (SiO2)

Favosites Fossil (Honeycomb Coral)

Favosites sp. (Extinct genus of tabulate coral)

Chert / River Pebble

Silicon Dioxide (SiO2)

Greenstone / Serpentinite

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

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 (Iron-stained)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Kimberlite with Diamond

Kimberlite (Porphyritic Peridotite)

Diamond (Colorless/White)

Carbon (C)

Diamond (in jewelry setting)

Diamond (Native Carbon, C)

Serpentinite (often called Jade or Nephrite substitute)

Serpentinite (composed primarily of Antigorite, Lizardite, or Chrysotile)

Serpentinite

Serpentinite (composed primarily of serpentine group minerals like lizardite, antigorite, and chrysotile)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Bivalve Fossil (Internal Mold/Steinkern)

Class Bivalvia (Fossilized Mold)

Coquina / Shell Limestone

Coquina (Bioclastic Limestone)

Chert (Flint variety)

Chert (SiO2)

Baltic Amber (Butterscotch or Egg Yolk Variety)

Succinite (chemical formula: C10H16O)

Chert (Flint variety)

Chert (SiO2)

Chert (and associated Sedimentary rocks)

Microcrystalline Silica (SiO2)

Chert (Black Chert / Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)