Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid
Snowflake Obsidian
Volcanic glass with Phenocrysts (SiO2 with Cristobalite inclusions)
igneous
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Chondrite Meteorite Fragment
Ordinary Chondrite (L or H type)
igneous
Ironstone Concretion (Moqui Marble type)
Ironstone Concretion (Fe2O3 with SiO2 core)
sedimentary
Amber-bearing Coal/Sedimentary Rock
Bituminous coal or carbonaceous siltstone with Fossilized Tree Resin (C10H16O)
sedimentary
Obsidian
Obsidian (volcanic glass, amorphous silica rich rock)
Igneous
Copper Ore / Altered Granodiorite
Cupriferous rock with silicate gangue
mineral
Obsidian arrowhead
Volcanic glass (predominantly rhyolitic SiO₂)
igneous
Limonite
FeO(OH)·nH2O
mineral
River Rock
Polished Siliceous Rock / Quartzite Pebble
sedimentary
Amber
Fossilized Tree Resin
gemstone
Jasper
Microcrystalline quartz (SiO2) with impurities
sedimentary
Limonite
FeO(OH)·nH2O
mineral
Pumice
Pumice (Volcanic Glass)
igneous
Tektite
Natural impact glass
meteorite
Chrysocolla in Matrix
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Blue Quartz
Silicon Dioxide (SiO2)
mineral
Ironstone Nodules in Chalk/Limestone
Limonite/Goethite concretions (FeO(OH)·nH2O) in Calcium Carbonate matrix (CaCO3)
sedimentary
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Sandstone
Arenite
sedimentary
Coquina
Biogenic Limestone (Coquina)
sedimentary
Chondrite Meteorite
Stone Meteorite (Chondrite)
meteorite
Concrete fragment with Aggregate
Anthropogenic Concrete with Calcarious and Siliceous Aggregate
sedimentary (anthropogenic/man-made)
Amber
Fossilized Tree Resin (Generic formula roughly C10H16O)
mineral
Apache Tears (Obsidian)
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Conglomerate with Quartzite Pebbles
Clastic sedimentary rock (Conglomerate)
sedimentary
Anthracite Coal
Coal (predominantly carbon)
sedimentary
Snowflake Obsidian
Vitreous Volcanic Glass (Siliceous Obsidian with Cristobalite inclusions)
igneous
Amber
Succinite (specifically for Baltic amber); Approximate formula: C10H16O
Organic Gemstone (Mineraloid)
Anthracite Coal
Anthracite (Carbon Content: 86%–98%)
metamorphic
Obsidian
Obsidian (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)
igneous
Anthracite Coal
Anthracite (high-rank coal / Carbon)
metamorphic
Obsidian
Volcanic glass (high silica volcanic rock)
igneous
Ironstone (with Limonite/Goethite)
Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Tektite (likely Indochinite)
Tektite (high-silica impact glass)
igneous