Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Category
Mineral And Organic Gemstone
Browse mineral and organic gemstone specimens identified by the Rock Identifier community.
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Garden Quartz
Included Quartz (SiO2 with accessory minerals such as Chlorite, Hematite, or Feldspar)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limestone (Concretionary or Tufa)
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (often called Flint or Jasper)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Fairburn Agate
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone Concretion
Sedimentary Clastic Rock (Silicate-rich)
sedimentary
Rhodochrosite
Manganese carbonate (MnCO3)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (and Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Orthoceras Fossil in Limestone
Orthoceras (extinct genus of cephalopods) in Carboniferous or Devonian Limestone
sedimentary
Petrified Wood
Silicified wood (Quartz/Chalcedony/Opal)
sedimentary
Chert (Jasper/Limonitic Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sulfidic Mudstone with Pyrite/Goethite
Sulfidic Siltstone/Mudstone (FeS2)
sedimentary
Petrified Wood
Silicified wood (primarily SiO2)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Petrified Wood (Agatized/Silicified Wood)
Silicified Paleoxylon (primarily SiO2)
sedimentary
Ferruginous Chert
Microcrystalline Quartz (SiO2) with Iron Oxides
sedimentary
Fossilized Crinoid Stem Segment
Crinoid (Phylum Echinodermata, Class Crinoidea)
sedimentary
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
mineral
Chert (Holey Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Coral (Rugosa or Solitary Coral)
Rugosa (Order), often referred to as 'Horn Coral' (Lithostrotionella or Grewingkia)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Citrine
Quartz (SiO₂) variety
Mineral
Chert with Quartz Veins
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst
Quartz (Silicon Dioxide with iron impurities), SiO2
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
gemstone
Amazonite
K(AlSi3O8) - Potassium Aluminum Silicate (variety of Microcline)
mineral
Chrysocolla
Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Amazonite
Amazonite (KAlSi3O8)
mineral
Chrysocolla (in Host Rock)
Hydrated copper silicate - Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O
mineral
Aquamarine (Beryl)
Beryl (Be3Al2Si6O18 with Fe impurities)
mineral
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Emerald
Beryl (Be₃Al₂(SiO₃)‑₆) with Chromium/Vanadium impurities
mineral
Amethyst (Rough Crystal)
Silicon Dioxide (SiO2 with ferric iron impurities)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral