Mineral Based Human Made Alloy

Tumbled Stone

Silicon dioxide / Various silicates

Amethyst (or Light Amethyst / Rose Quartz)

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Blue Cracked Quartz (Dyed Fire Crackle Quartz)

Silicon Dioxide (SiO2) with synthetic dye

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Desert Rose (Gypsum Rose)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Yooperlite (Syenite clast containing fluorescent Sodalite)

Sodalite-bearing Syenite

Native Gold

Native Gold (Au)

Gold

Native Gold (Au)

Limonite (Yellow Ochre)

Hydrated Iron Oxide (FeO(OH)·nH2O)

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Sapphire

Corundum (Al2O3)

Sandstone (Ferruginous)

Arenite with Iron oxide staining (SiO2 with Fe2O3)

Blue-green chrysocolla rough specimen

Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite

Fossilized Shark Tooth (Eroded)

Carcharodon sp. or Otodus sp. fragment (likely)

Pyrite

Iron Sulfide (FeS2)

Sandstone

Clastic sedimentary rock (Quartz arenite/Arkose)

Sandstone Concretion

Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Granite

Granite (Plutonic Igneous Rock)

Milky Quartz

Silicon Dioxide (SiO2)

Carborundum (Silicon Carbide)

Silicon carbide (SiC)

Limonite with Ironstone

Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O

Bituminous Coal (with Anthracite or Vitrinite inclusion)

Organic-rich Sedimentary Rock (Carboniferous classification)

Blue Goldstone

Synthetic glass with copper or cobalt/manganese inclusions

Shungite

Non-crystalline carbon (allotrope of carbon)

Sandstone

Arenite

Chert (often called Flint)

Silicon Dioxide (SiO2)

Limonite (Iron Ore)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Chert (or Jasper)

Microcrystalline Quartz (SiO2)

Blue Dyed Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Obsidian (Black)

Obsidian (High-silica volcanic glass)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Blue Slag Glass

Man-made Silicon Dioxide (Amorphous)

Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Opalite (Synthetic Opalized Glass)

Synthetic Silicon Dioxide (SiO2) glass

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment