Peacock Ore
Bornite (Cu5FeS4)
mineral
Category
Mineral Precipitate (Anthropogenic Context)
Browse mineral precipitate (anthropogenic context) specimens identified by the Rock Identifier community.
Learn about Mineral Precipitate (Anthropogenic Context) in the encyclopedia
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Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite in Matrix
Iron Sulfide (FeS2)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Extrusive)
igneous
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Granite
Granite (felsic intrusive igneous rock)
igneous
Fossilized Oyster Shell
Exogyra or Ostrea (Gryphaeidae/Ostreidae family)
fossil
Red Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Sandstone with Iron Oxide Staining
Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)
sedimentary
Turquoise (Blue Howlite / Magnesite imitation)
CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)
mineral
Red Sandstone
Arenite with iron oxide (Hematite) cement
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Sandstone (Red Sandstone)
Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide)
sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily SiO2 with Fe2O3 oxides)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Ruby
Corundum (Aluminium Oxide with Chromium impurities, Al2O3:Cr)
mineral
Andesite Porphyry (Geological Drill Core)
Andesite Porphyry
igneous
Serpentinite
Serpentinite (composed primarily of serpentine-group minerals like antigorite, chrysotile, and lizardite; chemical formula varies but generally Mg3Si2O5(OH)4)
Metamorphic Rock
Schist
Schist
metamorphic
Fossilized Shark Tooth (Otodus)
Otodus obliquus
fossil
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gold Placer (Gold Flakes and Nuggets)
Native Gold (Au)
mineral
Mica Schist with Quartz
Crystalline Schist (SiO2 + KAl2(AlSi3O10)(OH)2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
metamorphic
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2+KAl2(AlSi3O10)(OH)2)
metamorphic
Banded River Rock with Quartz Vein
Siltstone/Greywacke with Quartz (SiO2)
sedimentary
Sandstone with Quartz Vein
Arenite with SiO2 intrusion
sedimentary
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Granite
Granite
igneous
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Mica Schist with Garnet
Garnet-Mica Schist
metamorphic
Sandstone
Sandstone (Silicon Dioxide, SiO2)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Graywacke)
Arenite / Graywacke (SiO2 with lithic fragments)
sedimentary
Included Quartz (Garden Quartz / Lodolite)
Quartz (SiO2) with various mineral inclusions
Mineral