Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Category
Amorphous Solid
Browse amorphous solid specimens identified by the Rock Identifier community.
Chrysocolla
Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Coal (specifically Bituminous or Anthracite)
Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N
sedimentary
Obsidian
Obsidian (volcanic glass; primarily SiO2)
igneous
Coquina
Biogenic Limestone
sedimentary
Chrysocolla in Matrix
Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)
mineral
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Scoria (Lava Rock)
Scoria (extrusive volcanic rock)
igneous
Mahogany Obsidian
Obsidian (SiO2 + Fe2O3)
igneous
Amber
Succinite (fossilized resin, C10H16O)
mineral
Anthracite Coal
Anthracite (Carbon-rich Sedimentary-to-Metamorphic Rock)
metamorphic
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Amber
Succinite (Fossilized Tree Resin) - C10H16O
mineral
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite
Pumice
Pumice (volcanic glass with vesicular texture)
igneous
Apache Tear
Hydrated Obsidian (Volcanic Glass)
Igneous
Coquina / Shelly Limestone
Bioclastic Limestone (composed of CaCO3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Mahogany Obsidian
Volcanic Glass (predominantly SiO2 with Fe2O3 inclusions)
igneous
Tiffany Stone
Fluoritized Opal Beryllium Ore (principally Bertrandite, Be4Si2O7(OH)2)
metamorphic
Amber
Succinite (specifically for Baltic amber; fossilized tree resin)
Organic (Sedimentary-associated)
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Pumice
Pumice (a highly vesicular amorphous volcanic glass)
igneous
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Man-made Glass (Not a natural rock or mineral)
Limonite Concretion (Ironstone)
Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Pumice
Vesicular volcanic glass
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2 + oxide impurities)
igneous
Apache Tear
Obsidian (Hydrated Volcanic Glass, SiO2)
igneous
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Common Opal (Green Opal / Pistachio Opal)
Hydrated silica (SiO2·nH2O)
mineraloid
Gold Sheen Obsidian
Volcanic Glass (SiO2 + Fe3O4 / Gas Inclusions)
igneous
Zirconia (Ceramic) & Ion-X Glass
Zirconium Dioxide (ZrO2) and Ion-strengthened Aluminosilicate Glass
Synthetic Mineral / Glass
Coquina
Coquina (Biogenic Limestone / CaCO3)
sedimentary
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)
Anthracite Coal
Anthracite (Carbon-based metamorphic rock, 86-97% C)
metamorphic
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Amber (Cherry or Red variety)
Succinite (with various trace amounts of organic compounds)
Organic Gemstone (not a rock)