Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
Learn about Mineral And Organic Gemstone in the encyclopedia
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Chert (Flint)
Chert (Silicon Dioxide, SiO2)
sedimentary
Shark Tooth Fossil
Otodus sp. (possibly Cretalamna)
fossil
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Septarian Nodule (Thunder Egg)
Septarian Concretion (CaCO3 + CaMg(CO3)2 + SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2 - primarily Quartz/Chalcedony/Opal)
Mineral/Fossil (Sedimentary context)
Chert (Red Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Fire Opal (in matrix)
Hydrated Silica (SiO2·nH2O)
Mineraloid
Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)
Mixed Silicates and Sulfides (SiO2, FeS2)
mineral
Ferruginous Sandstone Concretion (Ironstone Phosphorite)
Ferruginous Sandstone (variable Fe-oxide/hydroxide composition)
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Precious Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Chert (River Pebble)
Microcrystalline silica (SiO2)
sedimentary
Chert (White Chert / Flint)
Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)
sedimentary
Green Aventurine
Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ruby (Raw Corundum)
Corundum (Al2O3) with Chromium traces
mineral
Chert with Quartz Druzy
Microcrystalline Quartz (SiO2) with Drusy Quartz Coating
sedimentary
Schorl (Black Tourmaline)
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Chrysocolla
Hydrated copper silicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Amazonite
Microcline (K(AlSi3O8))
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
Mineral
Jasper
Silicon Dioxide (SiO2)
sedimentary
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pearl
Calcium carbonate (CaCO3) - Aragonite/Calcite variety
mineral
Banded Chert
Cryptocrystalline Quartz (SiO2)
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O (Hydrous phosphate of copper and aluminum)
mineral
Rhodochrosite
Rhodochrosite, Manganese Carbonate (MnCO3)
mineral
Howlite
Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)
mineral
Picture Jasper
Silicon Dioxide (SiO2) with iron oxide and organic impurities
sedimentary
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary