Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Pumice
Extrusive volcanic rock (Vesicular Rhyolite/Dacite/Andesite)
igneous
Tektite (Indochinite)
Tektite (Natural Glass, SiO2 + Al2O3)
mineral
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Black Obsidian
Volcanic Glass (predominantly SiO2, Silicon Dioxide)
igneous
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Dinosaur Claw Fossil
Fossilized Theropod Claw (Vertebrate Palaeontological Specimen)
fossil
Petrified Wood
Silicified Wood (SiO2)
fossil
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Clastic Sedimentary Rock
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Bauxite
Aluminium ore / Hydrated aluminium oxides (AlOx(OH)3-2x)
sedimentary
Petrified Wood
Silicified wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Argillite
Argillite (Fine-grained sedimentary rock composed mostly of clay-sized particles)
sedimentary
Pumice
Pumice (volcanic glass foam)
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions (SiO2)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Obsidian
Obsidian (volcanic glass), primarily SiO2 (silicon dioxide)
igneous
Moqui Marble (Ironstone Concretion)
Goethite-limonite concretion (primarily FeO(OH) with Sandstone)
sedimentary
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Amber
Succinite (a specific common type) or Fossilized Tree Resin (C10H16O)
Mineraloid
Ferrocoke or Slag
Anthropogenic pyrometallurgical residue
igneous
Gossan (Iron Hat) with Quartz and Chlorite
Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite
Mineral/Metamorphic Substrate
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (composed primarily of Quartz sand with Hematite/Goethite shell)
sedimentary
Iron Slag
Iron Slag (Industrial Vitreous Material)
Mineral/By-product
Obsidian (Apache Tear)
Volcanic Glass (composed mainly of SiO2)
igneous
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Vesicular volcanic glass)
igneous
Tektite (Indochinite)
Tektite (High-silica impact glass)
mineraloid
Sandstone Geode (Unbroken)
Siliciclastic sedimentary rock (primarily Quartz)
sedimentary
Concrete
Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)
sedimentary (anthropogenic / man-made)
Amber
Succinicum (Organic Gemstone - Resinite)
mineraloid