Sandstone
Arenite (composed primarily of Quartz: SiO2)
Category
Browse mineral (man made aura treatment) specimens identified by the Rock Identifier community.
Sandstone
Arenite (composed primarily of Quartz: SiO2)
Chalcedony (Common Opal or Agate variant)
Silicon dioxide (SiO2) with trace hydration
Diamond
Diamond (Pure Carbon, C)
Granite
Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)
Ferruginous Sandstone (Ironstone)
Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)
Pyrite
Iron Sulfide (FeS2)
Desert Rose (also known as Sand Rose)
Gypsum (CaSO4·2H2O) or Barite (BaSO4) with sand inclusions
Granite
Granite (Phaneritic Quartz-Feldspar intrusive rock)
Granodiorite
Granodiorite (phaneritic intrusive igneous rock)
Pale green tumbled mineral fragment, likely serpentine or green calcite
Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph
Sandstone
Arenite (SiO2 based typically)
Diamond
Carbon (C)
Diamond
Carbon (C)
Rough Diamond
Diamond (pure Carbon, C)
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Obsidian
Obsidian (Volcanic Glass)
Chert (and/or Flint)
Microcrystalline Quartz (SiO2)
Nephrite Jade
Ca2(Mg, Fe)5Si8O22(OH)2
Chert (Green Chert or Jasper)
Microcrystalline Quartz (SiO2)
Diamond
Carbon (C)
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
Ruby
Corundum (Al2O3 with Chromium traces)
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Sandstone
Arenite (SiO2 based)
Granite
Granite (plutonic igneous rock)
Banded Calcite or Travertine
Calcium Carbonate (CaCO3)
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
Blue Goldstone
Aventurine Glass
Sandstone
Arenite (SiO2 primarily)
Diamond
C (Carbon)
Goldstone
Aventurine Glass (SiO2 + Cu small inclusions)
Sandstone (likely Fossilized Wood or Concrete Simulacrum)
Arenite / Silicified Wood / Anthropogenic Concrete
Granite
Phaneritic Felsic Igneous Rock
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
Chalcedony (Agate/Chert variety)
Silicon Dioxide (SiO2)
Pearl
Pearl (Calcium Carbonate with organic conchiolin, CaCO3)
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8) with Albite inclusions
Smoky Quartz
Silicon Dioxide (SiO2)
Diamond
Diamond (pure Carbon, C)
Silver (Jewelry form)
Native Silver (Ag)
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
Sandstone
Sandstone (composed predominantly of Quartz, SiO2, with Feldspar and Clay minerals)