Peridot (rough olivine crystals)
Olivine, chiefly forsterite–fayalite solid solution, (Mg,Fe)₂SiO₄; gem-quality olivine is called peridot
mineral
Category
Mineral, Jewelry
Browse mineral, jewelry specimens identified by the Rock Identifier community.
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Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Azurite with Malachite
Azurite: Cu3(CO3)2(OH)2 / Malachite: Cu2CO3(OH)2
mineral
Azurite in Matrix
Azurite (Cu3(CO3)2(OH)2)
mineral
Amazonite
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Lapis Lazuli and Green Aventurine
(Na,Ca)8(AlSi)12(SO4,S,Cl)2 and SiO2
mineral
Malachite
Copper Carbonate Hydroxide, Cu2CO3(OH)2
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)
FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)
mineral
Tiger's Eye
Silicon dioxide with crocidolite inclusions (SiO2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Red garnet (possible rough gem fragment)
Likely almandine garnet, Fe₃Al₂(SiO₄)₃; identification from the image is uncertain
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Native Gold (in Jewelry)
Gold (Au)
mineral
Malachite
Copper Carbonate Hydroxide, Cu2CO3(OH)2
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Magnesite or Howlite (dyed or naturally patterned)
Magnesium carbonate (MgCO3) or Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Raw quartz crystal pendant
Quartz (silicon dioxide, SiO₂), likely milky or cloudy quartz
mineral
Milky Quartz with Algae/Chlorite
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al2Si3O10(OH)2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst jewelry centerpiece
Amethyst, purple quartz (SiO₂), likely set with colorless diamonds or other gems
gemstone
Fossil Sea Urchin (Echinoid)
Echinoidea fossil (often replaced by silica or calcite)
fossil
Unidentified metallic mineral or meteorite fragment
Indeterminate; possible native metal-bearing sulfide or iron meteorite fragment
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Tumbled agate/chalcedony
Microcrystalline quartz (SiO₂), likely mossy or dendritic agate with iron-oxide inclusions
mineral
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
mineral
Diamond bracelet (gold-set)
Diamond, crystalline carbon (C); gold alloy setting
gemstone
Mixed Gemstone Rough
Various silicate and oxide minerals
mineral
Epidote-bearing Rock
Epidote / Silicate mineral aggregate
metamorphic
Peridot in Matrix
Olivine (Mg,Fe)2SiO4
gemstone
Orange chalcedony (possibly carnelian)
Microcrystalline quartz, SiO₂; carnelian is orange-red chalcedony colored mainly by iron oxides
mineral
Cubic Zirconia
Zirconium Dioxide (ZrO2)
mineral
Opal ring
Common opal, likely synthetic or assembled blue-green opal (hydrated amorphous silica, SiO₂·nH₂O)
gemstone
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8) with inclusions
mineral
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Yellow Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Fossilized Shark Tooth
Chondrichthyes (Class)
fossil
Polished orbicular agate beads
Microcrystalline quartz (SiO₂), chalcedony with orbicular banding
mineral