Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Category
Man Made Alloy (Metallic)
Browse man made alloy (metallic) specimens identified by the Rock Identifier community.
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Pyrite in Matrix (Commonly called Fool's Gold)
Iron Sulfide (FeS2)
mineral
Basalt
Mafic Igneous Rock
igneous
Gold Placer (Gold Flakes and Nuggets)
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Basalt (Crushed Roadstone)
Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Asphalt (Bituminous Slate/Sandstone)
Asphaltum / Bituminous Rock
sedimentary
Shungite
Non-crystalline carbon (Fullerenes / Carbon-60)
metamorphic
Copper Ore (with Azurite and Malachite)
Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)
mineral
Basalt
Mafic volcanic rock (Primarily Plagioclase Feldspar and Pyroxene)
Igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Basalt (Vitreous to Aphanitic Mafic Igneous Rock)
igneous
Basalt
Extrusive mafic igneous rock
igneous
Gold (in Opaque Matrix/Jewelry)
Native Gold (Au)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Red Hematite (Banded Iron Formation)
Hematite (Fe2O3)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Botryoidal Hematite (Kidney Ore)
Iron(III) oxide (Fe2O3)
Mineral
Basalt
Basalt
igneous
Pyrite
Iron Sulfide (FeS2)
mineral
Basalt
Basalt
igneous
Gold Nugget
Native Gold (Au)
mineral
Ferruginous Sandstone (Ironstone)
Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))
sedimentary
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Anthracite Coal
Anthracite (Carbon-based organic sedimentary/metamorphic rock)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Hematite
Hematite (Fe2O3)
mineral
Pink Quartzite
Quartzite (SiO2)
metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions), SiO2 + K(Al,Cr)2AlSi3O10(OH)2
mineral
Iron Slag
Anthropogenic Vitreous Ferrous Silicate
industrial byproduct (anthropogenic)
Yellow Aventurine
Silicon Dioxide with inclusions (SiO2 + Muscovite/Fuchsite)
mineral
Cinnabar
Mercury(II) sulfide (HgS)
mineral
Silver (Native Silver)
Native Silver (Ag)
mineral
Ferruginous Quartz
Iron-stained Quartz (Silicon Dioxide + Fe2O3 / FeO(OH))
mineral
Pyrite on Limestone
Iron Disulfide (FeS2) in Calcium Carbonate (CaCO3) matrix
sedimentary (matrix) / mineral (inclusion)