Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with impurities)
igneous
Category
Organic Mineraloid And Mineral
Browse organic mineraloid and mineral specimens identified by the Rock Identifier community.
Amber
Succinite (Resinite)
Organic Crystal (Mineraloid)
Amber
Succinicum (Succinite); C10H16O
Mineraloid (Organic)
Limonite (Ironstone)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
mineral
Black Obsidian
Volcanic Glass (SiO2 + impurities like Fe3O4)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Snowflake Obsidian
Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions
igneous
Obsidian
Volcanic Glass (SiO2)
igneous
Pearl (in a decorative hair comb setting)
Calcium carbonate (CaCO3) primarily as Aragonite, bonded with Conchiolin
Organic Mineraloid
Limonite (Iron Stone/Ocher)
Limonite (FeO(OH)·nH2O)
mineral
Amber (Burmite)
Fossilized tree resin (Succinite variant)
Organic mineraloid
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Red Amber (Burmite/Cherry Amber)
Succinite / Retinite (Organic Fossilized Resin, C10H16O)
Mineraloid (Organic)
Amber
Succinite (C10H16O)
Organic Mineraloid
Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions
igneous
Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Mineraloid
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Limonite (Yellow Ochre)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Ironstone)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
mineral
Limonite/Goethite Concretion
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Black Obsidian
Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Limonite (Iron Ore)
Limonite (Hydrous ferric oxides), generic formula FeO(OH)·nH2O
mineral
Black Obsidian
Obsidian (Amorphous Silicon Dioxide)
igneous
Mahogany Obsidian
Volcanic glass containing Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Amorphous volcanic glass (primarily SiO2)
igneous
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Amber
Succinite (fossilized tree resin)
mineraloid / sedimentary organic material
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)
mineral
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass)
Igneous
Obsidian
Amorphous volcanic glass (SiO2)
igneous
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral