Amber
Succinates (Organic Fossilized Resin)
mineral
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Ironstone Concretion (Boji Stone/Moqui Marble type)
Goethite/Hematite-encrusted Sandstone Concretion
sedimentary
Ironstone Concretion (Moqui Marble type)
Iron oxide concretion (Goethite/Hematite and Sandstone)
sedimentary
Dragon Stone
Argillaceous Sedimentary Rock (Ohko Stone)
sedimentary
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Chrysocolla
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Black Obsidian
Volcanic Glass (SiO2)
igneous
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Black Pearl (Tahitian or Irradiated Type)
Organic gemstone (Calcium Carbonate with Conchiolin Binding)
mineraloid
Amber
Succinite
Organic Mineraloid
Obsidian
Volcanic Glass (SiO2)
igneous
Shungite
Non-crystalline carbon (Fullerenes)
metamorphic
Anthracite Coal
Anthracite (Carbon-rich Sedimentary Rock)
sedimentary
Limonite (Ironstone)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Common Opal with Host Rock
Opal (Hydrated silica, SiO2·nH2O)
mineral
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Limonite (Iron Ore Congcretion)
Limonite (a mixture of hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
mineral
Coquina / Shell Limestone
Coquina (Bioclastic Limestone)
sedimentary
Pumice
Pumice (a highly vesicular amorphous silicate glass)
igneous
Tektite (Indochinite)
Tektite (Amorphous silica-rich impact glass)
igneous
Apache Tears (Obsidian)
Hydrated Volcanic Glass (Amorphous SiO2 + H2O)
igneous
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Slag (Industrial Glass Slag)
Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)
Mineraloid (Industrial byproduct)
Goldstone (Brown/Gold variety)
Aventurine Glass (SiO2 with Copper inclusions)
Synthetic/Man-made glass (often mistaken for a mineral)
Obsidian
Amorphous Volcanic Glass (primarily SiO2)
igneous
Hypersthene (or Enstatite/Ferrosilite)
Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)
Mineral
Olivine (likely Peridot variety)
Olivine Mineral Group (specifically Forsterite-Fayalite solid solution series); Chemical formula: (Mg,Fe)2SiO4
Mineral
Diamond
Carbon (C), specifically a solid form of the element carbon with atoms arranged in a crystal structure called diamond cubic.
Mineral
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
Dendritic Opal
Opalized Chalcedony with Manganese Inclusions (SiO2 · nH2O)
mineral
Opalite
Synthetic Opalised Glass
mineral
Sea Glass
Amorphous Silica (SiO2) with various additives
Mineraloid (Anthropogenic)
Pearl
Calcium Carbonate (Aragonite) - CaCO3
mineral
Bauxite
Bauxite (Al(OH)3 mixed with Fe2O3 and clay minerals)
sedimentary
Amber
Succinite (Fossilized Resin)
mineral
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic