Puddingstone (specifically Michigan/Gowganda Puddingstone)
Conglomerate (Jasper Conglomerate)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2 with Cristobalite inclusions)
igneous
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Tiffany Stone
Bertrandite (Be4Si2O7(OH)2) mixed with Fluorite (CaF2), Opal, and Chalcedony
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Mahogany Obsidian
Obsidian (Volcanic Glass) with Hematite/Magnetite inclusions
igneous
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Baltic Amber (Butterscotch variety)
Succinite
Organic Gemstone/Mineraloid
Anthracite
Anthracite Coal
sedimentary
Limonite and Goethite
Limonite (hydrated iron(III) oxide-hydroxide) and Goethite (α-FeO(OH))
mineral
Tiffany Stone
Bertrandite Fluorite (CaF2 + Be4Si2O7(OH)2)
metamorphic
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Obsidian
Volcanic glass
igneous
Obsidian
Obsidian (principally SiO2 with MgO and Fe3O4)
igneous
Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Pumice
Pumice (a highly vesicular extrusive igneous rock)
Igneous
Anthracite Coal
Anthracite (Carbon-based organic sedimentary rock exposed to metamorphic heat/pressure; Chemical composition is approximately 86%–98% Carbon)
metamorphic
Chrysocolla in Matrix
Hydrated copper silicate - (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Obsidian
Volcanic Glass (SiO2, usually 70% or more)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite over Sandstone)
sedimentary
Apache Tear
Obsidian (Volcanic Glass), formula: 70–75% SiO2 plus MgO, Fe3O4
igneous
Ferruginous Sandstone (Ironstone)
Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))
sedimentary
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with inclusions of Hematite or Magnetite)
igneous
Amber
Succinite (Formula: C10H16O)
Organic Mineraloid
Anthracite Coal
Anthracite (Carbon-based sedimentary-derived metamorphic rock)
metamorphic
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
mineral
Amber
Succinite (specifically for Baltic amber); chemical formula approximately C10H16O
Mineraloid
Obsidian
Volcanic Glass (SiO2 + minor impurities)
igneous
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Quartz with Limonite Staining
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
Mineral
Amber
Succinite (fossilized resin, C10H16O)
mineral
Obsidian
Obsidian (Volcanic Glass), primarily SiO2
igneous
Black Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Limonite (Iron Stone)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Anthracite Coal
Anthracite (Carbon)
metamorphic
Bauxite
Al2O3·2H2O (principally composed of gibbsite, boehmite, and diaspore)
sedimentary
Amber
Succinite (specific to Baltic amber), fossilized tree resin
mineraloid
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone