Man Made Glass (Often Grouped With Minerals In Lapidary)

Slag Glass / Industrial Slag

Anthropogenic Glass

Likely slate

Slate, a fine-grained metamorphic rock composed mainly of mica-group minerals and quartz

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Tourmalinated Quartz or Schorl

Silicate mineral, specifically Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4) or dark Tourmaline crystal cluster

Tiger’s eye

Quartz (SiO₂), pseudomorphic fibrous quartz with crocidolite inclusions

Quartzite

Quartzite (SiO2)

Blue Slag Glass

Amorphous Silica (Industrial byproduct)

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Aura Quartz / Rainbow Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Orthoclase (Potassium) Feldspar in Quartz

KAlSi3O8 (Potassium Aluminum Silicate)

Blue glassy cabochon, likely blue quartz or synthetic glass

Possibly dyed blue chalcedony/quartz (SiO₂); visual identification is inconclusive

Granite

Granite (composed primarily of Quartz, Feldspar, and Mica)

Milky Quartz Geode with Chlorite

Silicon Dioxide (SiO2) with Chlorite group inclusions

Sodalite

Na8(Al6Si6O24)Cl2

Serpentine-rich serpentinite

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and chromite

Sandstone

Sandstone (clastic sedimentary rock, predominantly SiO2)

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Chalcedony (Agate/Chert)

Chalcedony (Silicon Dioxide, SiO2)

Slag Glass

Silicon dioxide with impurities

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Diamond (or Cubic Zirconia simulant)

Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ

Obsidian

Volcanic Glass (SiO2)

Green Glass Cullet / Recycled Glass

Amorphous Silicon Dioxide (SiO2) with various metal oxides

Potassium Feldspar

K-Feldspar (KAlSi3O8)

Dumortierite in Quartz

Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)

Goldstone

Aventurine Glass (SiO2 + Cu small inclusions)

Quartz Pebble with Chlorite or Epidote Inclusions

Silicon Dioxide (SiO2) with inclusions

Diorite (Gneissic)

Diorite

Green Aventurine

Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)

Corundum (Sapphire variant)

Aluminium oxide (Al2O3)

Petrified Wood

Silicified Wood (SiO2)

Tiny pale-green mineral fragment

Likely chrysoprase or green quartz; identification is uncertain from the photograph

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Quartz with Sulfide Inclusions

Silicon Dioxide (SiO2) with metallic mineral inclusions

Chalcedony (Common Opal or Agate variant)

Silicon dioxide (SiO2) with trace hydration

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Blue-dyed Quartz Druzy

Silicon Dioxide (SiO2) with artificial pigment

Mica

Mica group (often Muscovite or Biotite)

Chert

Microcrystalline Quartz (SiO2)

Diamond

Cubic carbon (C)

Apache Tear

Obsidian (Hydrated Volcanic Glass) - SiO2 (with impurities)