Beach Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Category
Anthropogenic (Man Made Material Processed By Nature)
Browse anthropogenic (man made material processed by nature) specimens identified by the Rock Identifier community.
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Slag
Ferrous Slag (Siliceous industrial waste)
Anthropogenic (Man-made industrial byproduct)
Opalite
Synthetic Opalised Glass
mineraloid (synthetic)
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Terrazzo (with Marble and Granite fragments)
Cementitious or resinous composite containing Calcium Carbonate (CaCO3) and Silicates
sedimentary (man-made composite)
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Opalite
Man-made opalescent glass (SiO2 + metal oxides)
mineral (synthetic)
Pink Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Porcelain (Kaolin-based)
Alumina silicate ceramic (composed primarily of Kaolinite: Al2Si2O5(OH)4)
metamorphic (man-made/engineered)
Green Aventurine
Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
mineral
Sandstone Concretion
Clastic Sedimentary Rock (primarily SiO2 with mineral cement)
sedimentary
Chert Concretion (with typical hematite/limonite staining)
Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)
sedimentary
Green Glass (often marketed as 'Obsidian' or 'Green Quartz')
Amorphous Silica (SiO2) with copper or chromium additives
Mineraloid (Man-made)
Opalite
Synthetic Opalised Glass
Mineral (Synthetic / Man-made)
Quartz with Muscovite Mica
Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Brown Jasper (Likely)
Jasper (Cryptocrystalline Silicon Dioxide - SiO2)
Mineral
Cullet Glass (Man-made Glass Slag)
Amorphous Silica (SiO2) with chemical additives
Mineraloid
Blue Sapphire (Synthetic or Man-made Glass Imitation)
Corundum (Al2O3) if natural; Lead-glass or Spinal if synthetic
mineral
Goldstone (Synthetic Aventurescence Glass)
Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)
mineraloid / man-made material
Diamond
Native Carbon (C)
mineral
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Man-made earbud charging case (Not a rock or mineral)
Acrylonitrile Butadiene Styrene (ABS) Plastic with electronic components
Synthetic/Man-made object
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Green Slag Glass
Amorphous Silicon Dioxide (with metallic impurities)
Igneous (Anthropogenic)
Chert (Arrowhead/Tool variety)
Microcrystalline Quartz (SiO2)
sedimentary
Titanium Aura Quartz (Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic plutonic rock (dominated by Quartz, Feldspar, and Mica)
igneous
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Jade (Nephrite or Jadeite)
Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)
Metamorphic Rock / Mineral
Man-made Jewelry Charm (Enameled Metal)
Not a natural mineral; composed of base metal alloy (likely zinc or brass) and epoxy resin/enamel.
Synthetic / Manufactured Artifact
Jasper
Jasper (Silicified microcrystalline quartz) - SiO2
sedimentary
Synthetic Costume Glove (Paws)
Polyethylene terephthalate (Polyester) & Polyurethane blend
Non-geological / Man-made textile