Glazed Ceramic Tile
Fused Silicate-Clay composite
Synthetic (Man-made material mimicking natural stone)
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
White Coral
Corallium rubrum (biocarbonate calcium) / CaCO3
mineral
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (principally SiO2, 70% or more silica)
igneous
Anthracite Coal
Anthracite
metamorphic
Tektite (Indochinite)
Tektite (SiO2 + Al2O3, Glassy Melts)
igneous
Pink Opal / Peruvian Opal
Hydrated amorphous silicon dioxide (SiO2·nH2O)
Mineral
Limonite (Iron Ore)
Limonite (an amorphous mixture of hydrated iron oxides, primarily FeO(OH)·nH2O)
mineral
Tektite
Tektite (Amorphous silica rich glass)
mineral
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Tumbled Obsidian (possibly Mahogany Obsidian variant)
Volcanic Glass (Amorphous Silicon Dioxide, SiO2)
igneous
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Precious Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Ethiopian Opal (Welo Opal)
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Black Obsidian
Obsidian, volcanic glass (Amorphous SiO₂)
Igneous Rock
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Pumice
Vesicular volcanic glass (Amorphous silica mixed with various oxides)
igneous
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Pumice
Highly vesicular rhyolite/dacite (Amorphous glass)
igneous
Opal
Hydrated amorphous form of silica (SiO2·nH2O)
mineral
Limonite
Limonite (Hydrated iron(III) oxide-hydroxide) FeO(OH)·nH2O
mineral
Limonite (Iron Ore/Sandstone mixture)
Limonite (FeO(OH)·nH2O) often mixed with Goethite and sedimentary matrix
mineral
Limonite (Yellow Ochre)
FeO(OH)·nH2O (Hydrous iron(III) oxide-hydroxide mixture)
Mineral (Iron Ore)
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Ferrous Slag
Fused calcium-iron silicates (Industrial Slag)
Anthropogenic/Industrial byproduct
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite (Resinite)
mineraloid
Ironstone Concretions (Ironstone)
Ferruginous Sandstone or Siltstone (Fe2O3)
sedimentary
Ironstone (likely Limonite or Goethite)
Ferruginous sedimentary rock (FeO(OH)·nH2O)
sedimentary
Obsidian
Volcanic Glass (SiO2)
igneous
Boxwork Siderite or Sepatarian Nodule Weathering
Siderite (FeCO3) with secondary mineralization or Boxwork Geode fragment
sedimentary
Limonite Concretion (Ironstone)
Limonite / Goethite (FeO(OH)·nH2O)
sedimentary
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Obsidian
Volcanic glass
igneous
Amber
Amber (Succinite), fossilized tree resin
Mineraloid
Blue Goldstone
Aventurine Glass (Silicon Dioxide with metal inclusions)
man-made glass mineral simulant
Pumice (likely weathered/water-worn)
Vesicular volcanic glass
igneous
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Snowflake Obsidian
Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)
igneous
Limonite Concretion
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
sedimentary