Obsidian
Volcanic glass
igneous
Category
Mineraloid (Synthetic)
Browse mineraloid (synthetic) specimens identified by the Rock Identifier community.
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Black Obsidian
Volcanic Glass
igneous
Goldstone (Brown)
Aventurine Glass (Silicon Dioxide infused with Copper crystals)
mineraloid (man-made glass)
Amber
Succinite (Organic Mineraloid)
mineral
Obsidian
Volcanic glass
igneous
Black Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
The user-provided image does not contain a rock or mineral specimen
N/A
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Obsidian
Volcanic Glass
igneous
Black Obsidian
Volcanic Glass
igneous
Cubic Zirconia
Zirconium dioxide (ZrO2)
mineral
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Obsidian
Volcanic glass
igneous
Ruby (in costume jewelry context)
Corundum (Al2O3) with Chromium impurities
mineral
Obsidian
Volcanic Glass
igneous
Purple cabochon gemstone, likely amethyst or purple sapphire/spinel
Indeterminate from image; possible quartz (SiO₂), corundum (Al₂O₃), or spinel (MgAl₂O₄)
gemstone
Cubic Zirconia (simulant) or Diamond
ZrO2 (Cubic Zirconia) or C (Diamond)
gemstone
Opalite
Synthetic glass / Opalized glass
gemstone
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass
igneous
Loose faceted colorless gemstones, likely quartz or glass-like mineral chips
Most consistent with quartz (SiO₂), though the photograph cannot exclude synthetic cubic zirconia or glass
gemstone
Opalite (Synthetic Moonstone/Sea Opal)
Silicon Dioxide (SiO2) glass with metallic inclusions
Synthetic/Man-made Glass
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Obsidian
Volcanic Glass (Silica-rich glass)
igneous
Obsidian
Volcanic glass
igneous
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Red gemstone ring, likely synthetic ruby or red spinel
Ruby: corundum (Al₂O₃); spinel: MgAl₂O₄; exact identity requires testing
gemstone
Opalite
Synthetic Opalised Glass
glass
Opalite
Synthetic Opalised Glass
mineral
Opalite
Synthetic opalescent glass
glass
Asphalt / Road Aggregate
Bituminous Conglomerate (synthetic)
sedimentary
Ruby Lavender Quartz with Amethyst
Silicon dioxide with neodymium dopant (SiO2)
gemstone
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic glass
igneous
Obsidian
Volcanic Glass
igneous
Obsidian
Volcanic Glass
igneous
Mahogany Obsidian
Volcanic glass (high silica) with inclusions of Magnetite or Hematite
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Rainbow Hematite / Magnetic Hematite
Iron oxide (Fe2O3) - often synthetic/coated for beads
mineral
Red glassy cabochon, likely synthetic ruby or red glass
Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass
gemstone