Tektite
Natural Impact Glass
Category
Browse industrial byproduct (often confused with igneous rocks or meteorites) specimens identified by the Rock Identifier community.
Tektite
Natural Impact Glass
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Sandstone with Limonite/Goethite coating (Fe2O3·H2O)
Clear quartz sphere
Quartz (silicon dioxide, SiO₂)
Goethite / Limonite Concretion
Iron Hydroxide Oxide (FeO(OH))
Black Sapphire (Basaltic Blue Sapphire)
Corundum (Al2O3)
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Pink Sapphire (Corundum)
Aluminum Oxide (Al2O3) with Chromium/Iron impurities
Magnetite / Lodestone
Magnetite (Fe3O4)
Almandine Garnet
Fe3Al2(SiO4)3
Magnetite / Iron Ore
Magnetite (Fe3O4)
Ruby (Faceted)
Corundum (Al2O3 with Cr trace elements)
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
Chondrite Meteorite (Possibility)
Stony Meteorite (Chondrite)
Black Tourmaline
Schorl (Na(Fe2+)_{3}Al_{6} (BO_{3})_{3} (Si_{6}O_{18})(OH)_{4})
White Zircon
Zircon (Zirconium silicate, ZrSiO4)
Quartzite Pebble
Quartzite (composed primarily of Silica, SiO2)
Red Quartzite
Metamorphic Rock (rich in SiO2 with hematite inclusions)
Quartzite Pebble
Quartzite (SiO2)
Quartzite
Quartzite (SiO2)
Pyrite
Iron Sulfide (FeS2)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Martian Basalt Rock
Extrusive Mafic Igneous Rock (Basalt)
Tektite (Indochinite)
Tektite (Silica-rich natural glass)
Metallic iron meteorite fragments (probable)
Iron meteorite, chiefly kamacite (α-(Fe,Ni)) with possible taenite
Sapphire (Rough Corundum)
Corundum (Aluminum Oxide, Al2O3)
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
Quartzite
Quartzite (primarily SiO2)
Pink Quartzite
Quartzite (SiO2 with iron oxide inclusions)
Quartzite
Quartzite (SiO2)
Quartzite
Quartzite (SiO2)
Bronzite
MgSiO3 (Enstatite with 10-30% FeSiO3 in solid solution)
Citrine
Silicon dioxide (SiO2)
Garnet
Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3
Porphyritic Basalt (Amygdaloidal)
Porphyritic Mafic Volcanic Rock (Amygdaloidal Basalt)
Epidote with Unakite characteristics
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
Diorite
Diorite (intermediate intrusive igneous rock)
Diorite
Diorite (intermediate intrusive igneous rock)
Diorite
Diorite (Intermediate Plutonic Rock)
Chondrite Meteorite
L or H type Ordinary Chondrite
Diorite
Diorite (intermediate plutonic rock)
Chinese Writing Stone
Porphyritic Basalt or Porphyritic Andesite with Feldspar phenocrysts (SiO2-rich Silicates)
Garnet (Almandine)
Almandine Fe3Al2(SiO4)3