Polished tektite (likely indochinite)
Impact glass; natural silica-rich glass, approximately SiO₂ 70–80%
mineral
Category
Tektite
Browse tektite specimens identified by the Rock Identifier community.
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Likely obsidian (possibly tektite or slag glass)
Volcanic glass; primarily SiO₂, noncrystalline
igneous
Moldavite
SiO2 (+ Al2O3, FeO, K2O) - Natural Tektite Glass
gemstone
Green obsidian (likely moldavite)
Natural volcanic glass; if extraterrestrial-impact glass, moldavite (tektite)
gemstone
Moldavite
Tektite (Silicates with aluminum, iron, manganese, and potassium oxide glass)
meteorite
Libyan Desert Glass
Tektite (high-silica impact glass), SiO2 + tracing minerals
mineraloid / impactite
Moldavite
Tektite (Silica Glass - SiO2 + Al2O3, FeO, MgO, CaO, Na2O, K2O)
gemstone
Obsidian (likely black obsidian)
Volcanic glass; predominantly rhyolitic silica-rich melt (approximately 70–80% SiO₂)
igneous
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Note on Image Identification: Textile
N/A (Anthropogenic material)
not a rock
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Note: The image provided is a fabric sock, not a geological specimen.
Polyester-Cotton Blend with Elastane
Synthetic/Natural Fiber (Non-Geological)
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile
Synthetic Wolf Plush (Non-mineral)
Canis lupus similis (Prop material: Polyester & Synthetic fibers)
Synthetic material/Textile
Textile (Upholstery Fabric)
Woven Polyethylene/Polyester or Cotton Blend
Synthetic or Natural Fiber
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Note: Item is not a geological specimen
Polyester mesh and Ethylene-vinyl acetate (EVA) polymer
Synthetic / Anthropogenic Material
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
not a rock (synthetic material/costume)
Vesicular Basalt (Lava Rock)
Basalt with vesicular texture
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Pumice
Pumice
igneous
Serpentine
Antigorite/Chrysotile/Lizardite mix - Mg3Si2O5(OH)4
metamorphic
Fursuit (Synthetic Fur Specimen)
Canis anthropomorphus syntheticus
Anthropomorphic Textile Construct
Pumice
Pumice
igneous
Pumice
Felsic volcanic glass
igneous
Pumice (or Volcanic Tuff / Ash)
Pumice / Pyroclastic rock
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Lava Rock (Scoria)
Scoria (Basaltic Scoria)
igneous
Pumice (Basaltic/Scoria)
Vesicular Basalt / Scoria
igneous
Pumice
Pumice (Highly vesicular felsic volcanic rock)
igneous
Scoria
Vesicular Basalt / Scoria
igneous
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Vesicular Basalt
Vesicular Basalt (Mafic Volcanic Rock)
igneous
Vesicular Basalt (Scoria)
Scoriaceous Basalt (FeMgSiO3-rich)
igneous
Pumice
Vesicular volcanic glass (primarily SiO2)
igneous
Vesicular Basalt (Lava Rock)
Scoriaceous Basalt
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Pumice
Pumice (Volcanic Rock / Glass Froth)
igneous
Vesicular Basalt (Scoria)
Aphanitic Mafic Igneous Rock (Vesicular Basalt)
igneous
Pumice
Pumice (a highly vesicular volcanic rock)
igneous