Gold Ore
Native Gold (Au) in Matrix
mineral
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
Learn about Man Made Material (Jewelry, Metal Alloy) in the encyclopedia
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Iron Meteorite
Siderite (Iron-Nickel Alloy)
mineral
Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Gold Nugget
Native Gold (Au)
mineral
Quartz Vein in Siltstone
Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix
metamorphic
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Mineral (Organic)
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Aquamarine
Beryllium aluminum silicate (Be3Al2Si6O18)
mineral
Aquamarine (Pale variety)
Beryl (Be3Al2Si6O18)
mineral
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)
sedimentary
Chert Arrowhead
Chert (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (Common Opal/Jasper variety)
Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-rich metallic sulfide ore (probable pyrite-bearing rock)
Pyrite, FeS₂, in a quartz-rich host; exact identification is uncertain from the image
mineral
Serpentine
Antigorite-Lizardite-Chrysotile (Mg3Si2O5(OH)4)
metamorphic
Likely galena-bearing ore
Galena (PbS), possibly mixed with quartz or carbonate gangue
mineral
Quartz-rich pegmatite with green mica or chlorite
Granitic pegmatite; chiefly quartz (SiO₂), with feldspar and probable muscovite/chlorite
igneous
Black Onyx
Chalcedony (SiO2)
gemstone
Silver (Native Element / Alloy)
Silver (Ag)
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Red Sandstone
Arenite (Fe2O3 enriched)
sedimentary
Terrazzo (Synthetic Composite Rock)
Cementitious or Epoxy Resin-bound Aggregates
Man-made metamorphic-style composite
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Carved quartz skull, likely smoky quartz or gray chalcedony
Silicon dioxide (SiO₂), quartz or microcrystalline quartz
gemstone
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Chert (Flint)
Chert (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Vein on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond
Native Carbon (C)
gemstone
Iron meteorite candidate
Likely iron-rich meteorite, possibly an ordinary chondrite or weathered iron meteorite; confirmation requires testing
meteorite
Pyrite
Iron Sulfide (FeS2)
mineral
Granite / Diorite (Granodiorite)
Granodiorite / Quartz Diorite
igneous
Silver (Native Element)
Ag (Native Silver), with minor Copper (Cu)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Quartzite
Quartzite (SiO2)
metamorphic
Chert (specifically Black Chert or Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary