Pumice
Pumice
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
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Concretion
Sedimentary Concretion (Ironstone / Calcite Concretion)
sedimentary
Tektite
Impactite (Natural Silicate Glass)
meteorite
Snowflake Obsidian
Volcanic Glass (felsic volcanic glass with cristobalite inclusions)
igneous
Coal (Bituminous or Anthracite)
Carbonaceous Sedimentary Rock
sedimentary
Ironstone Nodule
Ferruginous Siltstone/Sandstone
sedimentary
Amber (Copal)
Succinate (Fossilized Tree Resin)
mineraloid
Pumice
Pumice (Volcanic Glass)
igneous
Amber
Succinite (Fossilized Tree Resin)
fossil
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Coquina
Coquina Limestone (CaCO3)
sedimentary
Tektite (Indochinite)
Tektite (High-silica impact glass)
igneous
Amber
Succinite (fossilized tree resin)
mineraloid
Anthracite Coal
Anthracite (Carbon Content: 86%-97%)
metamorphic
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Anthracite Coal
Anthracite (Carbon-rich metamorphic coal)
metamorphic
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (Approximate formula: C10H16O)
mineral
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)
Chondrite Meteorite
Ordinary Chondrite (OC)
igneous
Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Boulder Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Chrysocolla in Cuprite (Sonoran Sunrise)
Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O) (Chrysocolla) and Cu2O (Cuprite)
mineral
Blue Goldstone
Aventurine Glass (Silicon Dioxide infused with Cobalt/Copper)
Synthetic (Man-made Glass)
Moqui Marble (Shaman Stone)
Ironstone Concretion (Fe2O3 - Hematite/Goethite shell with Sandstone core)
sedimentary
Moqui Marble (Ironstone Concretion)
Goethite/Hematite Concretion (Fe2O3 / FeO(OH))
sedimentary
Apache Tear
Obsidian (Hydrated Volcanic Glass)
igneous
Mahogany Obsidian
Volcanic Glass with Hematite/Magnetite inclusions (SiO2 + Fe2O3)
Igneous
Ambergris
Ambra grisea
Organic (often found by beachcombers)
Chrysocolla in Quartz (Gem Silica)
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / SiO2 (Quartz)
mineral
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Common Opal (Green Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
mineral
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amber
Succinite (Formula: C10H16O)
mineral
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)
igneous
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Manufactured Glass (Simulant)
Ironstone (Limonitic Sandstone)
Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)
sedimentary