Obsidian
Volcanic Glass (SiO2)
igneous
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
Learn about Mineraloid (Man Made Glass) in the encyclopedia
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Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite inclusions
igneous
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid
Tektite (Indochinite)
Tektite (High-silica natural glass)
mineraloid
Tektite
Tektite (high-silica natural glass)
Mineraloid
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Obsidian
Volcanic Glass (70-75% SiO2)
igneous
Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Pink Opal
Hydrated Silicon Dioxide (SiO2 · nH2O)
mineraloid
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Obsidian
Obsidian
igneous
Obsidian (specifically Mahogany Obsidian)
Volcanic glass (high silica content, SiO2)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous
Amber
Succinite (Organic Mineraloid)
mineral
Mahogany Obsidian
Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Shungite
Shungite (carbon-rich Precambrian mineraloid)
mineral
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Mahogany Obsidian
Volcanic glass (Silicon Dioxide with Hematite/Magnetite inclusions)
igneous
Obsidian
Obsidian (volcanic glass), primarily SiO2 (silicon dioxide)
igneous
Amber
Succinite (C10H16O)
mineraloid
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic glass
igneous
Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
igneous
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Polished mahogany obsidian (likely)
Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides
igneous
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Volcanic glass (high silica volcanic rock)
igneous