Green Quartzite
Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite
metamorphic
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
Citrine
Silicon Dioxide (SiO2) with iron impurities
mineral
Amazonite
Microcline (KAlSi3O8) with trace lead (Pb) impurities
mineral
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst (Cabochon)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Amazonite
Amazonite (K(AlSi3O8))
mineral
Sunstone
Oligoclase (Plagioclase Feldspar) with inclusions - (Ca, Na)((Al, Si)4O8)
mineral
Gastropod Steinkern (Internal Mold Fossil)
Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix
sedimentary
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Turquoise
Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O
mineral
Turquoise
Turquoise (CuAl6(PO4)4(OH)8·4H2O)
mineral
General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)
Anhydrite (Calcium Sulfate, CaSO4)
Mineral
Diamond (or Diamond Simulant)
Carbon (C)
mineral
Stromatolite
Stromatolite (Cyanobacteria-formed Organo-sedimentary structure)
sedimentary
Banded Sandstone (Zebra Stone)
Arenite with Iron Oxide Banding (Liesegang rings)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Amethyst
Amethyst (Purple Quartz); formula: SiO2 (Silicon Dioxide)
mineral
Sunstone
Oligoclase (a plagioclase feldspar variant), (Na,Ca)(Al,Si)4O8
mineral
Unakite
Epidotized Granite
metamorphic
Moonstone (Variety of Orthoclase Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Unakite (Epidotized Granite)
Epidotized Granite
metamorphic
Aquamarine
Beryl (Be3Al2Si6O18 with trace Fe2+)
Mineral
Rhodonite
Rhodonite (Manganese silicate, (Mn,Fe,Mg,Ca)SiO3)
mineral
White Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Fuchsite (Green Muscovite in Quartz)
Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Carnelian (a variety of Chalcedony)
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2 (Silicon Dioxide)
Mineral
Green Aventurine
Silicon dioxide with Fuscite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
mineral
Ring with an Orange Inlay
N/A (Man-made object)
Man-made Object (Ring)
Sandstone Concretion
Sedimentary concretion
Sedimentary
Sandstone or Limestone
Sedimentary Rock
Sedimentary
Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Rough Green Beryl (Emerald variety)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Sunstone
Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8
mineral
Rough Citrine Quartz
Silicon Dioxide (SiO2) with ferric iron impurities
mineral
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Orthoclase Feldspar
Orthoclase (KAlSi3O8)
Mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Garnet (likely Almandine or a blend)
Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.
Mineral