Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled Quartz
Silicon Dioxide (SiO2)
mineral
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Pyrite
Iron Pyrite (FeS2)
mineral
Eudialyte
Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
mineral
Diamond (in jewelry)
Carbon (C)
mineral
Diamond (in Jewelry)
Carbon (C)
mineral
Turquoise and Hematite
Turquoise: CuAl6(PO4)4(OH)8·4H2O; Hematite: Fe2O3
mineral
Native Gold (in Jewelry)
Gold (Au)
mineral
Red Jasper (Chert)
Silicon Dioxide (SiO2) with iron inclusions
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Magnesite or Howlite (dyed or naturally patterned)
Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Amethyst and mixed gemstone bracelet
Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads
gemstone
Hemimorphite
Hemimorphite (Zn4Si2O7(OH)2·H2O)
mineral
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Tumbled blue-gray mineral specimen, likely labradorite
Labradorite, a calcium-rich plagioclase feldspar; approximate formula (Ca,Na)(Al,Si)₄O₈
mineral
Likely labradorite-bearing rock
Labradorite (plagioclase feldspar; approximately (Ca,Na)(Al,Si)₄O₈)
igneous
Pink tourmaline crystal (likely polished or rough-cut)
Elbaite, Na(Li₁.₅Al₁.₅)Al₆(Si₆O₁₈)(BO₃)₃(OH)₃
gemstone
Amethyst
Quartz, silicon dioxide (SiO₂), colored purple by trace iron and irradiation
gemstone
Emerald in Quartz Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
gemstone
Citrine
Silicon Dioxide (SiO2)
gemstone
Amethyst (Rough)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz Druzy on Matrix
Silicon Dioxide (SiO2)
mineral
Prehnite
Ca2Al2Si3O10(OH)2
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Geode
Quartz / Chalcedony nodule with mineralized cavity
sedimentary
Tiger's Eye
Silicon dioxide with crocidolite inclusions (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
mineral
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Geode
Quartz / Chalcedony nodule
sedimentary
Quartz (Chalcedony/Agate nodule)
Silicon dioxide (SiO2)
mineral
Lake Superior Agate
SiO2 (Quartz variety chalcedony)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Peach Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst Cluster
Silicon Dioxide (Quartz variety: Amethyst) - SiO2
mineral