Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
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Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Amethyst
Silicon dioxide / Quartz (SiO2+Fe4+)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper
Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions
igneous
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
Quartz (Tumbled)
SiO2 (Silicon Dioxide)
mineral
Lapis Lazuli (Simulated)
Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Red Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Taaffeite
BeMgAl4O8 (Beryllium Magnesium Aluminum Oxide)
mineral
Mixed Gemstones and Minerals
Mixed Silicates and Oxides (Quartz/Amethyst, Aventurine, Sodalite, Chert, Jasper)
mineral
Black spinel bead bracelet
Spinel (magnesium aluminate), MgAl₂O₄
gemstone
Quartz crystal cluster (likely iron-stained quartz)
Quartz, silicon dioxide (SiO₂), with possible iron-oxide inclusions
mineral
Amethyst and Rose Quartz Beads
Crystalline Quartz (SiO2) with trace elements
gemstone
Black onyx-style bead bracelet
Likely polished black chalcedony (microcrystalline quartz, SiO₂); the beads may also be dyed agate or another black stone.
mineral
Amethyst
Silicon Dioxide with Iron impurities (SiO2)
mineral
Jasper with Quartz Vein
Silicon Dioxide (SiO2)
sedimentary
Polished malachite tower
Malachite, Cu₂CO₃(OH)₂ (basic copper carbonate)
mineral
Pyrite in Matrix (Gold-colored Chalcopyrite or Pyrite)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Quartz (Druzy or Chalcedony variant)
Silicon Dioxide (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex silicate rock containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)
metamorphic
Zebra Jasper
Tektite variety of Silicon Dioxide (SiO2) with inclusions
sedimentary
Tumbled carnelian/chalcedony
Carnelian, a reddish-orange variety of microcrystalline quartz (SiO₂)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Polished garnet bead bracelet
Garnet group, likely almandine–pyrope solid solution; commonly approximated as Fe₃Al₂(SiO₄)₃–Mg₃Al₂(SiO₄)₃
gemstone
Black Sapphire
Corundum (Al2O3 with inclusions of hematite or ilmenite)
mineral
Turquoise
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral
Dalmatian Stone
Peralkaline rhyolite
igneous
Purple cabochon gemstone, likely charoite
Charoite, a complex potassium-calcium silicate mineral; identification from the image is uncertain
gemstone
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)
Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)
fossil
Faceted color-change gemstone, likely synthetic alexandrite or glass imitation
Alexandrite: chrysoberyl, BeAl₂O₄; exact identification requires gemological testing
gemstone
Banded Agate (Crazy Lace / Botswana Agate Beads)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Blue gemstone, likely iolite or blue sapphire
Iolite (cordierite, Mg₂Al₄Si₅O₁₈) or corundum (sapphire, Al₂O₃)
gemstone
Fluorite
Calcium Fluoride (CaF2)
mineral