Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Category
Mineraloid (Synthetic)
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Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, ZrO₂ (synthetic zirconium dioxide); possibly synthetic glass or lab-grown diamond
gemstone
Pearl (Biogenic Mineral)
Calcium Carbonate (primarily Aragonite) with Conchiolin; CaCO3
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic zirconium dioxide, ZrO₂); possibly colorless quartz or laboratory diamond
gemstone
Goldstone
Aventurine glass
mineral (man-made glass)
Green Opal (Prase Opal)
SiO2 · nH2O (Hydrated Silicon Dioxide)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
Mineral variant / Gemstone
Cubic Zirconia (Jewelry Setting)
Cubic Zirconia (ZrO2)
gemstone
Cubic Zirconia (Faceted)
Zirconium Dioxide (ZrO2)
mineral
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Magnetite or Hematite-rich Ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium trace impurities)
mineral
Orange Sapphire
Corundum (Al2O3)
gemstone
Ametrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Colorless faceted gemstone, likely cubic zirconia
Cubic zirconia (synthetic ZrO₂), possibly glass or white sapphire
gemstone
Strawberry Quartz (or Sunstone / Tumbled Quartz)
Silicon Dioxide (SiO2) with Hematite/Lepidocrocite inclusions
mineral
Rough White Zircon
Zircon (Zirconium Silicate, ZrSiO4)
mineral
Ruby
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Diamond (in jewelry)
Cubic Carbon (C)
mineral
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Ruby (Rough/Raw)
Corundum (Al2O3:Cr)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled black stone, likely black obsidian
Obsidian — natural volcanic glass, primarily SiO₂
igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Mahogany Obsidian
Volcanic glass containing Magnetite/Hematite
igneous
Obsidian
Volcanic Glass (predominantly SiO2, approximately 70% or more)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Snowflake Obsidian
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Mahogany Obsidian
Obsidian (SiO2 + Fe2O3)
igneous
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral