Orthoclase Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Category
Gemstone
Browse gemstone specimens identified by the Rock Identifier community.
Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2)
mineral
Sapphire in a ring
Corundum (Al2O3)
mineral
Green Quartz (Prasiolite)
Crystalline Silicon Dioxide (SiO2)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminium)
mineral
Turquoise
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Mixed gemstone bead strand, likely amethyst and assorted colored stones
Likely purple quartz (amethyst, SiO₂) mixed with unidentified green, orange, and reddish beads
gemstone
Cut gemstone, likely diamond
Diamond (crystalline carbon, C)
gemstone
Citrine
Silicon Dioxide (Quartz variety), SiO2
mineral
Brown Garnet
Andradite or Almandine Garnet (general formula X3Y2(SiO4)3)
mineral
Moonstone
Orthoclase feldspar (KAlSi3O8)
mineral
Blue glass-like bead or gemstone keychain ornament
Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image
gemstone
Dalmatian jasper beads
Commercially “Dalmatian jasper”; commonly spotted, silica-rich rock sold as jasper, though many specimens are feldspar-rich rock rather than true jasper (microcrystalline quartz).
metamorphic
Agate (Beaded Jewelry)
Silicon Dioxide (SiO2)
gemstone
Red Jasper (Polished Point Pendant)
Silicon Dioxide with Iron Oxide impurities (SiO2 + Fe2O3)
mineral
Lapis Lazuli
Rock composed mainly of lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), calcite, and pyrite
metamorphic
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Malachite / Copper Ore
Cu2CO3(OH)2
mineral
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Chalcedony (Carnelian Agate pebble)
Silicon Dioxide (SiO2)
mineral
Red Jasper
Jasper (Silicate mineral - SiO2)
sedimentary
Red Jasper
Jasper (Silicon Dioxide with Hematite inclusions), SiO2
sedimentary
Yellow Jasper
Jasper (SiO2) with iron hydroxide inclusions
sedimentary
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Pearl
Biogenic CaCO3 (Aragonite)
mineral
Fuchsite (Chrome Mica)
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Red Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Feldspar
Potassium or Plagioclase Feldspar (KAlSi3O8 - NaAlSi3O8)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Labradorite
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Sugilite
KNa2(Fe,Mn,Al)2Li3Si12O30
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Tsavorite Garnet
Grossular Garnet, Ca3Al2(SiO4)3
mineral
Opalized Belemnite Fossil
Belemnitella (Opalized replacement)
fossil
Blue Apatite
Fluorapatite (Ca5(PO4)3(F,Cl,OH))
mineral
Rhodonite
Rhodonite (MnSiO3)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral