Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Category
Igneous Or Sedimentary (Anthropogenic Modification)
Browse igneous or sedimentary (anthropogenic modification) specimens identified by the Rock Identifier community.
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Green Sea Glass
Man-made vitreous material (silica glass)
gemstone
Mystic Topaz
Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)
mineral
Likely weathered metallic mineral or slag fragment
Uncertain; possibly limonite/goethite-coated iron mineral, or industrial iron slag
mineral
Gneiss and Igneous Rock Collection
Foliated Metamorphic Rock (Gneiss) / Igneous Rocks
metamorphic
Titanium Aura Quartz (Bismuth-coated Druzy)
Silicon Dioxide (SiO2) with Titanium/Metal vapor coating
mineral
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Cobalt Blue Slag Glass
Amorphous Silicon Dioxide (anthropogenic) with Cobalt additives
mineraloid
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Tumbled Black Stone
Unknown (possibly basalt, obsidian, or black jasper)
igneous or sedimentary
Possible tektite or volcanic glass specimen
Natural silica glass; composition commonly near SiO₂, but exact identification requires chemical testing
mineral
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Banded Metamorphic Rock
Gneiss or Schist
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Common Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
Mineral Specimen
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite or Granitic Gneiss
Granitoid / Gneiss
Igneous / Metamorphic
Gneiss
Gneiss
metamorphic
Quartz Geode (with Calcite influence)
Silicon Dioxide (SiO2) with possible Calcium Carbonate (CaCO3)
mineral
Asphalt (Bituminous pavement)
Bituminous concrete / Asphalt
Sedimentary (Anthropogenic)
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Iron-rich slag or weathered ironstone fragments
Probably hematite–goethite material; possibly industrial iron slag (Fe₂O₃/FeO(OH))
mineral
Gneiss or Schist
Gneiss or Mica Schist with Garnet
Metamorphic
Banded Slag Glass (Leland Blue/Frankfort Green style)
Anthropogenic Glass Specimen (Amorphous Silicon Dioxide with impurities)
mineral
Foliated metamorphic rock, likely gneiss or mica schist
Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph
metamorphic
Gneiss
Metamorphic Gneiss
metamorphic
Quartz Geode
Silicon Dioxide (SiO2) - Crystalline Quartz
mineral
Carnelian / Agate
Silicon Dioxide (SiO2) - Chalcedony
mineral
Gneiss with Quartz Vein
Gneiss containing Quartz (SiO2) filler
metamorphic
Banded Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Ferruginous Slag (Iron Smelting Byproduct)
Anthropogenic Vitreous Silicate (often containing Fayalite: Fe2SiO4)
Mineraloid/Anthropogenic (Technofossil)
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Gneiss
Gneiss
metamorphic