Gold Nugget
Native Gold (Au)
mineral
Category
Organic (Paper And Cellulose)
Browse organic (paper and cellulose) specimens identified by the Rock Identifier community.
Quartz (Chert/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Diamond (or Cubic Zirconia simulant)
Carbon (C) or Zirconium Dioxide (ZrO2)
mineral
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Emerald and Diamond (Jewelry Setting)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities) and Carbon (C)
mineral
Sunstone
Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Ammonite Fossil (Polished Half / Cleoniceras)
Ammonoidea (Subclass), often Cleoniceras genus; fossilized with Calcite (CaCO3) and Aragonite
Sedimentary
Goldstone
Aventurine glass (Synthetic glass with copper inclusions)
mineraloid / man-made glass
Granite Pebble
Felsic intrusive igneous rock
igneous
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Calamites Fossil (Horsetail Stem)
Calamites (Genus), part of the class Equisetopsida
sedimentary
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Jasper (Green/Dragon Blood variety)
Silicon Dioxide (SiO2) with iron/clay inclusions
sedimentary
Bauxite
Hydrated Aluminum Oxides (primarily Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Diaspore α-AlO(OH))
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Concrete / Anthropogenic Conglomerate
Man-made composite material (Portland cement, aggregate, and water)
not a natural rock
Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
Fancy Jasper
Silicon Dioxide (SiO2)
mineral
Larimar
Pectolite (NaCa2Si3O8(OH))
mineral
Chalcedony Geode Fragment
Microcrystalline Quartz (SiO2)
mineral
Carnelian Agate
Chalcedony (SiO2 with Iron Oxide impurities)
mineral
Zoisite with Ruby
Anyolite (Calcium aluminum hydroxy silicate with Corundum) Ca2Al3(SiO4)3(OH)
metamorphic
Agate Geode Slice (with Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
mineral
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Rough Diamond
Diamond (Native Element Carbon, C)
mineral
Tektite (Indochinite)
Tektite (SiO2 + Al2O3, Glassy Melts)
igneous
Fluorite (Fluorescent)
Calcium Fluoride (CaF2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Pink Dragon Vein Agate
Silicon Dioxide (SiO2) with artificial dye additives
mineral
Siltstone Pebble
Siltstone
sedimentary
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Yellow Quartzite (River Pebble)
Quartzite (SiO2 with iron oxide impurities)
metamorphic
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble (Hag Stone / Adder Stone)
Silicon Dioxide (SiO2)
mineral