Cupronickel Coin
Copper-Nickel Alloy (typically 75% Cu, 25% Ni)
anthropic metallic specimen
Category
Anthropic Metallic Specimen
Browse anthropic metallic specimen specimens identified by the Rock Identifier community.
Sandstone-based Concrete Fragment
Cementitious Composite with Sedimentary Aggregate
sedimentary (man-made/anthropogenic)
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Pyrite with Vesicular Matrix
Iron Disulfide (FeS2)
mineral
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Pyritic Quartzite
Quartzite with Pyrite inclusions (FeS2)
metamorphic
Micrometeorite (Spherule)
Extraterrestrial Accretion Spherule
mineral
Pyrite in Quartz (Drill Core)
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions
igneous/metamorphic (hydrothermal)
Uncertain dark metallic mineral specimen
Possibly galena (lead sulfide, PbS), though the image is too blurred for reliable identification
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Magnetite / Hematite mix
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyritic Quartzite
Metequartzite with FeS2 (Pyrite) inclusions
metamorphic
Pyrite Cubes in Matrix
Iron Disulfide (FeS2) in Host Matrix
mineral side rock
Quartz-bearing Pegmatite with Metallic Sulfides
Pegmatite / Quartz-Feldspar Matrix with Pyrite and Mica
igneous
Rainbow chalcopyrite (“peacock ore”)
Chalcopyrite, CuFeS₂, commonly artificially tarnished or heat-treated
mineral
Native silver specimen (probable)
Silver, Ag; possibly silver-bearing sulfide or electrum
mineral
Pyrite Schist
Metamorphic rock containing FeS2 (Pyrite) with mica and quartz
metamorphic
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
igneous
Metallic sulfide mineral fragment, likely bornite or chalcopyrite
Bornite (Cu₅FeS₄) or chalcopyrite (CuFeS₂)
mineral
Muscovite Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 matrix)
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
Mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Unidentified metallic-looking mineral fragment
Indeterminate; possible galena, magnetite, or metal-rich sulfide/ore fragment
mineral
Hematite
Hematite (Fe2O3)
mineral
Botryoidal Hematite
Hematite (Iron(III) oxide, Fe2O3)
mineral
Gold bearing Quartz with Sulfides
Auriferous Quartz with Pyrite/Arsenopyrite (Au + SiO2)
mineral
Galena (probable)
Galena, lead sulfide (PbS)
mineral
Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)
Copper-bearing polymetallic mineral aggregate (Cu-minerals)
mineral
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
Pyrite-rich Volcanic Rock
Iron Disulfide (FeS2) in Volcanic Matrix
igneous
Native Copper in Matrix
Native Copper (Cu)
mineral
Metallic Ornament / Jewelry
N/A - This is an artificial object, not a geological specimen.
This appears to be a man-made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen.
Likely metallic mineral specimens
Probably native iron or iron oxide/hydroxide material; exact identification requires testing
mineral
Gold
Native Gold (Au)
mineral
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
mineral
Native copper nugget
Native copper (Cu)
mineral
Hematite
Hematite (Fe2O3)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Sunstone
Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)
mineral
Turquoise (with Hematite)
CuAl6(PO4)4(OH)8·4H2O
mineral