Serpentinite
Serpentinite (complex of lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)
metamorphic
Category
Man Made Material (Jewelry, Metal Alloy)
Browse man made material (jewelry, metal alloy) specimens identified by the Rock Identifier community.
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Iron Meteorite
Siderite (Iron-Nickel alloy)
meteorite
Pyrite
Iron Sulfide (FeS2)
mineral
Serpentinite
Serpentinite (Hydrous magnesium iron phyllosilicate)
metamorphic
Chert (Nodule)
Chert (Alpha-Quartz, SiO2)
sedimentary
Beryl (Aquamarine variety)
Beryllium Aluminum Cyclosilicate (Be3Al2Si6O18)
mineral
Slag Glass
Glassy Silicate Residue
industrial byproduct
Diamond (or Cubic Zirconia / Gemstone Ring)
C (Carbon) for natural Diamond
gemstone
Ferrochrome Slag
Anthropogenic silicate/oxide glass (Complex silicate matrix with Cr-Fe-Si inclusions)
Industrial byproduct (often confused with igneous rocks or meteorites)
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Chert (Chert / Flint Variety)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
sedimentary
Dragon Vein Agate (Dyed/Treated)
Agate (SiO2)
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Fossilized Shark Tooth (Eroded)
Carcharodon sp. or Otodus sp. fragment (likely)
fossil
Diamond (set in a eternity ring band)
Carbon (C)
gemstone
Diamond (Faceted)
Carbon (C)
gemstone
Aura Quartz (Cranberry or Magenta Aura Quartz)
Silicon dioxide coated with titanium/niobium (SiO2)
mineral
Biotite-rich mica schist
Mica schist, dominated by biotite mica (K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂), with probable quartz and feldspar
metamorphic
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Diamond
Carbon (C)
mineral
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Pink faceted gemstone, likely synthetic ruby or pink sapphire
Corundum (Al₂O₃), possibly chromium-colored ruby; synthetic origin likely
gemstone
Serpentine
Hydrous magnesium iron silicate, (Mg,Fe)3Si2O5(OH)4
metamorphic
Chert (Jasper/Flint variety)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Chromite
Chromite (FeCr2O4)
mineral
Goldstone (blue-goldstone–style glass) beads
Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral
mineral
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
mineral
Red Sandstone (Iron-Rich)
Arenite (Fe2O3)
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
Mineral
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (Hydrated magnesium iron phyllosilicate)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Asphalt (Bituminous Concrete)
Bituminous Concrete / Pavement
man-made (synthetic rock)
Dark rounded pebble, likely basalt or slag
Probable fine-grained mafic rock; possibly basalt (plagioclase–pyroxene) or industrial iron/steel slag
igneous