Black Obsidian
Obsidian (Volcanic Glass, SiO2+)
igneous
Category
Mineraloid (Man Made Glass)
Browse mineraloid (man made glass) specimens identified by the Rock Identifier community.
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Tektite (Indochinite)
Impact Glass (SiO2 + Al2O3)
mineraloid
Libyan Desert Glass
Natural Silica Glass (SiO2 with minor iron and titanium)
mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Obsidian
Volcanic glass (mainly SiO2 with inclusions)
igneous
Chalcedony (or a variety of Chalcedony, likely Agate or Jasper)
Chalcedony (SiO₂)
Mineral (or mineraloid if microcrystalline)
Hematite Beads
Hematite (Fe2O3)
Mineral
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Precious Opal
SiO2·nH2O (Hydrated Silicon Dioxide)
mineraloid
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Black Obsidian
Volcanic Glass (SiO2)
igneous
Green Opal or Yellow Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Tektite (Indochinite)
Tektite - High-silica amorphous glass (SiO2 + Al2O3)
mineraloid
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 with Hematite/Magnetite inclusions)
igneous
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (primarily SiO2)
igneous
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Slag (Industrial Glass)
Anthropogenic Amorphous Vitreous Silicate
mineraloid
Polished black obsidian pyramid/block
Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)
igneous
Fulgurite
Lechatelierite (Silica glass), typically SiO2
mineraloid
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Man-made Carved Stone (Scream Mask/Skull motif)
Carved Soapstone or Serpentine-rich rock
Anthropogenic (Man-made artifact)
Amber
Succinates (C10H16O)
mineraloid
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Goldstone (aventurine glass)
Synthetic copper-bearing soda-lime glass; commonly sold as red goldstone
gemstone
Mahogany Obsidian
Volcanic Glass (Silicate: SiO2 + Fe2O3)
igneous
Amber
Succinrite (Organic Gemstone)
mineraloid
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Tektite (Indochinite)
Tektite (High-silica impact glass)
mineraloid
Obsidian (Gold Sheen)
Obsidian (SiO2 + impurities)
igneous
Amber
Succinite (fossilized tree resin)
mineraloid
Baltic Amber
Succinite (Polmerized conifer resin)
mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Amber
Succinite (organic hydrocarbon)
mineraloid
Amber
Succinite (Resinous fossilized tree sap)
Mineraloid