Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
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.
Geode with Quartz and Chalcedony
Silicon Dioxide (SiO2)
Sandstone (Ferruginous)
Arenite with Iron Oxide (Fe2O3) cement
Dragon Vein Agate
Chalcedony (cryptocrystalline silica, SiO2) variety Agate
Granite
Phaneritic plutonic rock (Quartz, Feldspar, Mica)
Granite with Orthoclase and Hematite Staining
Phaneritic Felsic Igneous Rock (primarily SiO2 with KAlSi3O8)
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
Quartz (Tumbled/Polished Pebble)
Silicon Dioxide (SiO2)
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
Quartz (Quartzite)
Silicon Dioxide (SiO2)
Quartz (Druzy or Geode fragment)
Silicon Dioxide (SiO2)
Peacock Ore (Bornite or Chalcopyrite treated with acid)
Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)
Shale (Beach-worn)
Laminated Pelite (primarily clay minerals and quartz)
Rough Quartz (likely Rose or Amethyst variety)
Silicon Dioxide (SiO2)
Fluorite
Fluorite (CaF₂)
Black Onyx
Silicon dioxide (SiO2) - Chalcedony variety
Druzy Quartz
Quartz (Silicon Dioxide, SiO2)
Blue Onyx (Dyed Agate)
Cryptocrystalline Quartz (SiO2) with artificial pigment
Citrine Quartz (likely heat-treated)
Silicon Dioxide (SiO2)
Chalcedony (Common Agate)
Silicon Dioxide (SiO2)
Milky Quartz (Gold-bearing Prospecting Specimen)
Silicon Dioxide (SiO2)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
Sandstone Concretion
Sedimentary concretion
Quartz
Silicon Dioxide (SiO₂)
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
Gold Nugget
Native Gold (Au)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3(OH)4)
Sandstone with Ironstone Banding
Clastic Sandstone (composed of Quartz with Hematite/Limonite bonding)
Red Jasper
Jasper (Silicon Dioxide, SiO2)
Red Chalcedony (likely dyed)
Chalcedony (a variety of Quartz), SiO2
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
Green Aventurine
Silicon Dioxide (SiO2) with inclusions
Jasper (likely river-worn)
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Smoky Quartz (with Iron Oxidation)
Silicon Dioxide (SiO2)
Ironstone Concretion / Goethite Nodules
Ironstone (composed primarily of Goethite FeO(OH) and Limonite)
Quartz Pebble (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
Pebble or Cobble (likely composed of sandstone or conglomerate)
Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)
Quartz with Mica inclusions (likely Schist or Gneiss host)
Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)