Pumice
Pumice
igneous
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Learn about Amorphous Solid in the encyclopedia
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Snowflake Obsidian
Volcanic Glass with Cristobalite Inclusions (SiO2)
igneous
Pumice
Pumice (Volcanic Rock / Glass Foam)
igneous
Chrysocolla in Matrix
Hydrated copper silicates (Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O))
mineral
Chondrite Meteorite
Stony Meteorite (Ordinary Chondrite)
meteorite
Apache Tear
Obsidian (Hydrated Volcanic Glass, SiO2)
igneous
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Limonite (Iron Ore)
Limonite (mixture of hydrated iron(III) oxide-hydroxides)
Mineral
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Red Ochre (Hematite-rich Clay)
Limonitic/Hematitic Claystone (Fe2O3 with clay minerals)
Sedimentary
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Zirconia (Ceramic) & Ion-X Glass
Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass
Synthetic Mineral / Glass
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Pumice
Vesicular volcanic glass
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + oxide impurities)
igneous
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Sandstone with Dendritic Manganese Oxides
Sandstone (SiO2 predominant) with Oxide Dendrites (MnO2)
sedimentary
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
Amber
Succinite
Organic Mineraloid
Obsidian (Apache Tear)
Volcanic Glass (SiO2)
igneous
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)
Tektite (Indochinite)
Tektite (impactite), primarily high-silica glass (SiO2)
igneous
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Coprolite
Coprolite
sedimentary
Bituminous Coal
Organic-rich sedimentary rock (Complex hydrocarbons)
sedimentary
Ironstone Concretion
Ironstone (primarily Siderite or Limonite / Goethite, FeO(OH)·nH2O)
sedimentary
Fossilized Gastropod in Limestone
Gastropoda (Class) in Fossiliferous Limestone
sedimentary
Unakite
Unakite (Epidotized Granite)
metamorphic
Shale
Shale (comprised mostly of clay minerals and quartz)
sedimentary
Iron Slag
Iron/Steel Slag (Ferrosilicate Glass)
industrial byproduct (anthropogenic material)
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Pink Opal
Hydrated silicon dioxide (SiO2·nH2O) with inclusions
mineral
Amber
Succinite (Fossilized Tree Resin)
mineral
Moqui Marble (Shaman Stone)
Iron Oxide Concretion (Limonite/Hematite over Sandstone)
sedimentary
Iron Slag
Anthropogenic pyrometallurgical byproduct
igneous
Amber
Succinite (fossilized resin)
mineral