Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Category
Browse this appears to be a man made metallic object, likely jewelry, not a natural rock, mineral, or geological specimen. specimens identified by the Rock Identifier community.
Green Agate
Silicon Dioxide (SiO2) - Chalcedony variety
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
Chert (Brown variety)
Silicon Dioxide (SiO2)
Granite
Phaneritic plutonic igneous rock (SiO2 range 65-75%)
Blue Banded Agate (Dyed)
Silicon Dioxide (SiO2) - variety of Chalcedony
Green Aventurine
Aventurine (a variety of Quartz, SiO2)
Quartz
Quartz (SiO2 - Silicon Dioxide)
Pyrite
Iron Sulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Pyrite
Iron Sulfide (FeS2)
Banded Rhyolite (likely Green Jasper/Agate variety)
Silicon Dioxide (SiO2) with mineral inclusions
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Riverstone Quartzite (Water-worn Siltstone/Quartzite)
Metamorphosed Quartz-rich Arenite (SiO2)
Basalt with Calcite Veins
Basalt (containing CaCO3 inclusions)
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
Gold Flake
Native Gold (Au)
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)
White Quartz Pebble
Silicon Dioxide (SiO2)
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
Sunstone (Orthoclase Feldspar variant)
Orthoclase (KAlSi3O8) with inclusions
Fossilized Shark Tooth
Carcharodon carcharias (fossilized) / Hydroxyapatite permineralized with silica or iron
Quartz crystal with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Native Copper with Malachite and Chrysocolla
Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]
Garnet (almandine or pyrope variety)
Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3
Aventurine
Quartz (Aventurine variety)
Amethyst
Quartz (SiO2) variety
Chert (Jasper-like)
SiO2 (Cryptocrystalline Quartz)
Chert (specifically Agate/Jasper variety)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Turquoise
Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O
Moonstone
Orthoclase Feldspar (formula: (K,Na)AlSi3O8)
Quartz (Milky or Smoky Quartz)
Silicon Dioxide (SiO2)
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
Sunstone (Feldspar variety)
Oligoclase or Andesine (Na,Ca)(Al,Si)4O8
Obsidian
Obsidian (volcanic glass)
Sandstone
Arenite