Amber (Sumatran / Indonesian Red Blue)
Succinum (Fossilized Tree Resin)
fossil
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Snowflake Obsidian
Spherulitic Volcanic Glass (primarily SiO2)
igneous
Chrysocolla Cuprite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)
mineral composite
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Mahogany Obsidian
Volcanic Glass (with inclusions of Magnetite or Hematite)
igneous
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Obsidian
Obsidian (Volcanic Glass)
igneous
Dragon Stone
Ohko Stone (Argillaceous sedimentary rock)
sedimentary
Green Slag
Anthropogenic Silicate Glass
Mineraloid (Industrial byproduct)
Tufa
Calcareous Tufa (CaCO3)
sedimentary
Obsidian
Obsidian (principally SiO2 silicon dioxide)
igneous
Moqui Marble
Iron Oxide Concretion (Limonite/Hematite shell with Sandstone core)
sedimentary
Chert (Common Opal variant)
Silicon Dioxide (SiO2)
sedimentary
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Obsidian
Obsidian (Volcanic Glass)
igneous
Snowflake Obsidian
Obsidian with Cristobalite inclusions (70–75% SiO2)
igneous
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Chrysocolla on Quartz/Rhyolite matrix
Hydrated copper phyllosilicate mineral: (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Baroque Pearl
Calcium Carbonate (Aragonite or Calcite) and Conchiolin
Organic Gemstone
Snowflake Obsidian
Spherulitic Obsidian (Volcanic Glass with Cristobalite inclusions)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
igneous
Amber
Fossilized Tree Resin (Generic formula: C10H16O)
mineral
Fossiliferous Limestone (Chertified Limestone)
Calcium Carbonate (CaCO3) often replaced by Microcrystalline Silica (SiO2)
sedimentary
Puddingstone
Conglomerate (typically quartz-rich or jasper-rich)
sedimentary
Basalt with Scoria and potential Olivine/Pyroxene inclusions
Vesicular Basalt
igneous
Pumice (with oxidation)
Pumice (Vitreous pyroclastic rock)
igneous
Amber
Succinite (Fossilized Tree Resin), C10H16O
Organic Mineraloid
Amber
Succinite (Organic Mineraloid)
mineral
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Obsidian
Volcanic Glass (comprised primarily of SiO2)
Igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Shale with Limonite/Hematite Staining
Argillaceous sedimentary rock with Iron Oxides (FeO(OH)·nH2O / Fe2O3)
sedimentary
Pumice
Pumice (Vesicular Felsic Glass)
igneous
Yellow Ocherous Siltstone (Limonitic Shale)
Limonitic Siltstone / Goethite-rich Sedimentary Rock
sedimentary
Snowflake Obsidian
Volcanic Glass with Spherulite inclusions (Chemical composition: 70–75% SiO2 + MgO, Fe3O4)
igneous
Vesicular Basalt (or Porphyritic Scoria)
Vesicular Basalt
igneous
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Chrysocolla and Azurite in Matrix
Hydrated copper phyllosilicate (Chrysocolla - Cu2H2Si2O5(OH)4) and Copper carbonate (Azurite - Cu3(CO3)2(OH)2)
mineral