Black Opal
Hydrated Silica (SiO2·nH2O)
Category
Browse mineraloid (synthetic) specimens identified by the Rock Identifier community.
Black Opal
Hydrated Silica (SiO2·nH2O)
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (SiO2) with metallic oxide impurities
Cullet (Slag Glass)
Amorphous Silica (Industrial byproduct)
Amber
Succinate (Fossilized Tree Resin)
Amber (specifically Red or Cherry Amber)
Succinite (Resinite); Chemical formula: C10H16O
Amber
Succinates (C10H16O)
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
Amber
Succinite (with approximate formula C10H16O)
Amber
Succinite (C10H16O)
Natural White Pearl
Calcium Carbonate (Aragonite/Calcite) with Conchiolin - CaCO3
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Tektite
Tektite (high-silica natural glass)
Precious Opal
Hydrated silica (SiO2·nH2O)
Tektite (Indochinite)
Tektite - High-silica amorphous glass (SiO2 + Al2O3)
Amber
Succinate (Organic Fossilized Resin)
Amber
Succiniferous fossil resin (C10H16O)
Amber
Succinite (specific to Baltic amber), fossilized tree resin
Amber
Succinite (Approximate formula: C10H16O)
Amber
Succinite (Resinous fossilized tree sap)
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Precious Opal
Hydrated Silica (SiO2·nH2O)
Amber
Succinite (organic hydrocarbon)
Burmese Amber (Burmite)
Burmite (C10H16O)
Amber
Succinates (Organic Fossilized Resin)
Pink Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Amber
Succiniferous fossil resin (C10H16O)
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Blue sapphire ring
Corundum, aluminum oxide (Al₂O₃), blue variety colored mainly by iron and titanium
Black Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
Black Obsidian
Volcanic Glass (SiO2)
Snowflake Obsidian
Volcanic glass containing Spherulitic Cristobalite (SiO2)
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2 + Fe2O3)
Obsidian
Volcanic Glass (70-75% SiO2)
Opal
Hydrated Silica (SiO2·nH2O)
Gold Sheen Obsidian
Obsidian (volcanic glass with SiO2 + gas inclusions)
White Precious Opal
Hydrated Silica (SiO2·nH2O)
Limonite (Hydrated Iron Oxide / Bog Iron)
FeO(OH)·nH2O
Obsidian
Volcanic Glass (SiO2)
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
Obsidian
Volcanic Glass (SiO2)