Pyrite Concretion (Grapestone)
Iron Sulfide (FeS2) Concretion
sedimentary
Category
Man Made Alloy (Metallic)
Browse man made alloy (metallic) specimens identified by the Rock Identifier community.
Learn about Man Made Alloy (Metallic) in the encyclopedia
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Concrete Fragment
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Diamond (or Simulant)
Carbon (C)
gemstone
Sea Glass
Silicon dioxide (mostly)
mineral
Fluorite (Polished Point/Tower)
Calcium Fluoride (CaF2)
mineral
Quartz pebble (Quartztite fragment)
Silicon Dioxide (SiO2)
mineral
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Exposed Aggregate Concrete (Pea Gravel)
Concrete with Siliceous Alluvial Gravels
sedimentary (man-made conglomerate)
Chert (Arrowheads)
Microcrystalline Quartz (SiO2)
sedimentary
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Sea Glass
Man-made silicate glass
gemstone
Opalite
Man-made opalescent glass
gemstone
Opalite
Man-made opalized glass
mineral
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Iron Meteorite
Siderite (Iron-Nickel Alloy)
meteorite
Standing Liberty Quarter (Silver Specimen)
Native Silver alloy (Ag with Cu traces)
mineral
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Mystic Topaz
Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating
mineral
Gold
Aurum (Au)
Mineral (Metal)
Opalite
Synthetic Opalite Glass / Opalized Glass
gemstone
Asphalt Concrete
Bituminous conglomerate
sedimentary
Sea Glass
Man-made vitreous material
mineral
Sea Glass
Man-made silicate glass
sedimentary
Sandstone Concretion
Limonitic Sandstone Concretion
sedimentary
Asphalt (Road Aggregate)
Bituminous conglomerate
sedimentary
Stainless Steel Spoon
Iron-Chromium Alloy (Fe + Cr + Ni)
mineral-based human-made alloy
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Concrete Rubble with Aggregate
Hardened Portland Cement Paste with Coarse Aggregate
Anthropogenic (Man-made)
Concrete
Anthropogenic Conglomerate
sedimentary
Concrete Paver (Artificial Cementitious Rock)
Hydrated Portland Cement Aggregate
Sedimentary (Synthetic)
Unidentifiable Rock Fragment
Uncertain
Asphalt Concrete (Bituminous Conglomerate)
Anthropogenic Bituminous Conglomerate
sedimentary
Crushed Stone (Likely Limestone or Granite)
Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite
sedimentary or igneous
Silver (Morgan Dollar)
Native Silver (Ag) - 90% Silver, 10% Copper alloy
mineral
Chert Arrowhead (Projectile Point)
Microcrystalline Quartz (Chert or Flint)
sedimentary
Concretion (Sandstone)
Carbonate-cemented Sandstone Concretion
sedimentary
Opalite
Synthetic Glass (Silica-based)
gemstone
Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral