Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Gemstone)
Browse mineral (gemstone) specimens identified by the Rock Identifier community.
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Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Amazonite
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2), Quartz variety
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
Chalcedony (Agate nodule fragment)
Silicon Dioxide (SiO2)
mineral
Copper Ore Bearing Rock
Host rock with secondary copper minerals (such as Malachite, Azurite, and Chrysocolla)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Sunstone
Feldspar group (Plagioclase / Oligoclase)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (KAlSi3O8) with lead impurities
mineral
Cat's Eye Chrysoberyl
Chrysoberyl (BeAl2O4)
mineral
Amazonite
Microcline (KAlSi3O8 with lead impurities)
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) - (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions
mineral
Sunstone
Plagioclase Feldspar (containing (Ca,Na)(Al,Si)4O8 with Hematite or Copper inclusions)
mineral
Emerald with Matrix (Emerald in Mica Schist)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amazonite
Potassium Feldspar (Microcline), K(AlSi3O8)
mineral
Amazonite
Microcline (variety of Feldspar), K(AlSi3O8)
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Amethyst
Silicon dioxide / Quartz (SiO2+Fe4+)
mineral
Amethyst
Amethyst (Silicon Dioxide, SiO2 with Iron impurities)
mineral
Pearl
Calcium Carbonate (primarily Aragonite and Calcite), CaCO3
mineral
Likely polished blue-green gemstone
Indeterminate from image; possibilities include sapphire (corundum, Al₂O₃), aquamarine (beryl, Be₃Al₂Si₆O₁₈), or blue-green tourmaline
gemstone
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Multi-stone gemstone ring
Likely faceted blue topaz or synthetic blue stone with clear stones, possibly cubic zirconia or diamond; metal setting appears silver-colored alloy
gemstone
Red garnet (possible almandine or pyrope), cut/polished
Garnet-group silicate; likely almandine, Fe₃Al₂(SiO₄)₃, or pyrope, Mg₃Al₂(SiO₄)₃
gemstone
Turquoise (with Hematite)
CuAl6(PO4)4(OH)8·4H2O
mineral
Carnelian
Carnelian (subset of Chalcedony); SiO2 with Iron Oxide impurities
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral