Obsidian
Obsidian (Volcanic Glass)
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Anthracite Coal
Anthracite
metamorphic
Ferromanganese Nodule
Polymetallic Nodule (composed primarily of MnO2 and Fe2O3)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich metamorphic rock)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide) with impurities
igneous
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Anthracite Coal
Anthracite
metamorphic
Tektite (Indochinite)
Tektite (High-silica natural glass)
igneous
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Anthracite Coal
Anthracite (C)
sedimentary
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Limonite (Ironstone Concretion)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Obsidian (Volcanic Glass)
igneous
Amber
Amber (C10H16O)
mineral
Amber
Succinite (C10H16O)
mineral
Anthracite Coal
Anthracite C
metamorphic
Ironstone Concretion
Ferruginous Sandstone / Iron-rich Sedimentary Rock
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Chrysocolla in Quartz (Quantum Quattro variant)
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) often mixed with SiO2
mineral
Bog Iron / Limonite Concretion
Goethite/Limonite mixture (FeO(OH)·nH2O)
sedimentary
Amber
Succinite (Organic Mineraloid) - C10H16O
mineral
Moqui Marble (Concretion)
Iron Oxide Concretion (Hematite/Goethite)
sedimentary
Limonite (Iron Ore)
Goethite and related iron hydroxides (FeO(OH)·nH2O)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Amber (specifically Burmese Amber or Burmite)
Succiniferous fossil resin (C10H16O)
mineraloid
Anthracite Coal
Anthracite
metamorphic
Apache Tear
Obsidian (Volcanic Glass), SiO2 + MgO, Fe3O4
igneous
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Obsidian
Obsidian (Volcanic Glass, primarily SiO2)
igneous
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Limonite (Bog Iron)
Limonite (Hydrated iron(III) oxide-hydroxide) - FeO(OH)·nH2O
mineral
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Tektite (Indochinite)
Tektite (High-silica natural glass)
igneous
Amber
Succinite (fossilized resin)
Organic Mineraloid
Tektite (Indochinite)
Tektite (natural glass, SiO2 + Al2O3)
mineral
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid