Organic (If Resin) Or Synthetic (If Glass); Simulating Sedimentary Or Metamorphic (For Natural Stones)

Fossil Shark Tooth (embedded in matrix)

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

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Jasper (Yellow/Brown variety)

Silicon Dioxide (SiO2) with iron oxide impurities

Rose Quartz

Silicon dioxide (SiO2)

Yellow Chalcedony or River Jasper

Silicon Dioxide (SiO2)

Rose Quartz

Silicon dioxide (SiO2)

Ferruginous Sandstone (with Iron Oxide staining)

Clastic Sedimentary Rock - Quartz Arenite/Wacke

Geode (unopened nodule)

Silicon Dioxide (SiO2) Nodule

Green Chalcedony (likely Green Agate or Chrysoprase)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst (Druzy Cluster)

Amethyst (Silicon Dioxide with Iron impurities), SiO2

Chert (Field Stone/Jasper variety)

Microcrystalline Quartz (SiO2)

Conglomerate

Conglomerate (clastic sedimentary rock)

Rose Quartz

SiO2 (Silicon Dioxide)

Vesicular Basalt (commonly mistaken for Slag)

Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Limestone

Sedimentary Calcite (CaCO3)

Honeycomb Coral Fossil (Petoskey-type Coral)

Favosites (Extinct Colonial Tabulate Coral), CaCO3

Yellow Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Rose Quartz

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

Honeycomb Coral Fossil

Favosites (extinct genus of tabulate coral)

Amethyst (Pale/Lavender variety)

Silicon Dioxide (SiO2)

Brown Jasper (Likely)

Jasper (Cryptocrystalline Silicon Dioxide - SiO2)

Chalcedony Nodule in Matrix

Silicon Dioxide (SiO2)

Banded Calcite (often sold as 'Travertine' or 'Mexican Onyx')

Calcium Carbonate (CaCO3)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Banded Iron Formation (BIF)

Banded Iron Formation with Hematite and Jasper

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Satin Spar Gypsum

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Amber

Succinite (C10H16O)

Kunzite

Spodumene (LiAlSi2O6)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Fossilized Brachiopod/Bivalve in Limestone

Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)

Wishing Stone (Basalt or Siltstone with Quartz/Calcite Vein)

Basalt (SiO2+MgO+FeO) or Siltstone with a Quartz (SiO2) or Calcite (CaCO3) vein

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Milky Quartz (Gold-bearing Prospecting Specimen)

Silicon Dioxide (SiO2)

Bivalve Fossil (Internal Mold)

Class Bivalvia (Phylum Mollusca)

Wonderstone (Liesegang Sandstone)

Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))