Pyrite in Quartz
Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)
mineral
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
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Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst
Quartz (SiO2)
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Blue Quartz
Silicon Dioxide (SiO2) with inclusions
mineral
Lake Superior Agate
Agate (Cryptocrystalline variety of Quartz, SiO2)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with chromium/vanadium impurities
mineral
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Botryoidal Hematite
Iron(III) oxide (Fe2O3)
mineral
Diamond (in a jewelry setting)
Carbon (C)
mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Malachite
Copper Carbonate Hydroxide (Cu2CO3(OH)2)
mineral
Probable fossil-bearing rock or mineral concretion
Unidentified carbonate-rich concretion with a possible fossil inclusion
fossil
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Cubic Zirconia (Simulated Diamond)
Zirconium dioxide (ZrO2)
mineral
Agate
Chalcedony SiO2
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron Oxide inclusions
sedimentary
Turquoise (set in silver jewelry)
Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Lapis Lazuli
Na6Ca2(Al6Si6O24)(S,SO4,Cl)1-2 (primarily containing Lazurite with inclusions of Calcite and Pyrite)
metamorphic
Metal Alloy (Jewelry)
Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.
Man-made Material (jewelry, metal alloy)
Amazonite
Microcline Feldspar (KAlSi3O8)
mineral
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Potassium Feldspar (Orthoclase)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Red cabochon gemstone ring (likely glass or synthetic stone)
Undetermined; the image does not establish a natural mineral identity
gemstone
Amethyst Stalactite Slice
Crystalline Quartz (SiO2) with trace Iron (Fe4+)
mineral
Garnet-set butterfly brooch
Likely almandine or pyrope garnet, iron–aluminum silicate (Fe₃Al₂Si₃O₁₂ or Mg₃Al₂Si₃O₁₂)
gemstone
Fossilized shell fragment
Likely calcitic or aragonitic bivalve/gastropod shell; exact taxon indeterminate
fossil