Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Mahogany Obsidian
Volcanic Glass (Silicate: SiO2 + Fe2O3)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Amber
Succinite (organic hydrocarbon)
mineraloid
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid
Obsidian
Obsidian (volcanic glass), primarily SiO2 (silicon dioxide)
igneous
Mahogany Obsidian
Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Mahogany Obsidian
Obsidian (volcanic glass with hematite/magnetite inclusions)
igneous
Precious Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Leland Blue Stone
Anthropogenic Iron Smelting Slag
mineraloid
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Amber
Succinrite (Organic Gemstone)
mineraloid
Black Obsidian
Amorphous volcanic glass (SiO2)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Amber
Succinite (fossilized tree resin)
mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Pink Opal
Hydrated Silicon Dioxide (SiO2 · nH2O)
mineraloid
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Mineraloid
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
igneous
Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
igneous
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Black obsidian
Volcanic glass; predominantly silica-rich, noncrystalline SiO₂
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Black obsidian (likely)
Volcanic glass; primarily silica-rich, noncrystalline SiO₂ composition
igneous
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Tumbled black stone, likely obsidian
Obsidian — volcanic glass, chiefly silica-rich rhyolitic composition
igneous
Obsidian
Obsidian
igneous
Obsidian (likely Apache tear or flaked obsidian)
Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, non-crystalline)
igneous
Polished mahogany obsidian (likely)
Volcanic glass; primarily silica-rich rhyolitic glass (SiO₂), with iron oxides
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (SiO2 + impurities)
igneous