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

Blue Quartz (specifically Dumortierite Quartz)

SiO2 (Silicon Dioxide) with inclusions of AlAl6BSi3O18 (Dumortierite)

Chert (varietal: Jasper or Flint)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Peacock Ore (Chalcopyrite)

Chalcopyrite (CuFeS2)

Amethyst (Tumbled)

Amethyst (Silicon Dioxide, SiO2 + Fe4+)

Smoky Quartz

Silicon Dioxide (SiO2)

Blue Banded Agate (Dyed)

Silicon Dioxide (SiO2) - variety of Chalcedony

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Limonite/Hematite impurities)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Magnetite / Ironstone

Magnetite (Fe3O4)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Snowflake Obsidian (or similar porphyritic volcanic rock)

Obsidian with Spherulites (if glassy), or Porphyritic Rhyolite/Andesite (if crystalline groundmass)

Chevron Amethyst

Silicon Dioxide (SiO2) with trace Iron impurities

Yellow Quartz (Citrine/Yellow Chalcedony)

Silicon Dioxide (SiO2)

Blue Sapphire (Ceylon)

Corundum (Al2O3) with traces of Iron and Titanium

Smoky Quartz

Silicon Dioxide (SiO2)

Chert / Flint (with Crinoid Stem Molds)

Microcrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Rugose Coral)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Smoky Quartz (with possible Feldspar inclusions)

Silicon Dioxide (SiO2)

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2)

Amethyst (Tumbled)

Quartz (Silicon Dioxide, SiO2) with iron impurities

Slate

Slate (Foliated Metamorphic Rock)

Jasper with Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Blue Quartzite (Blue Aventurine / Dumortierite Quartz)

Quartzite with inclusions (SiO2 with AlAl4BSi3O18)

Fancy Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Fulgurite

Fulgurite (Lechatelierite-rich variety)

Graphite Schist

C (Carbonaceous Schist)

Smoky Quartz (with possible Garnet inclusions)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO₂)

Chert (variously known as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Cockle Shell (Fossil or Recent)

Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)

Smoky Quartz

Quartz (Silicon Dioxide) - SiO2

Citrine (Heat-treated Amethyst)

Citrine Quartz (SiO2)