Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
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.
Sandstone (with Iron Staining)
Arenite (composed primarily of SiO2 with Fe2O3 staining)
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
Sandstone
Arenite (SiO2 based)
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
Rose Quartz and Milky Quartz
Silicon Dioxide (SiO2)
Gneiss (specifically a Banded Gneiss pebble)
Gneiss (High-grade Regional Metamorphic Rock)
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
Turquoise (Blue Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Banded Agate (Botswana Agate)
Silicon Dioxide (SiO2)
Green Aventurine
Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
Chert (Flint) Pebble
Microcrystalline Quartz (SiO2)
Black Tourmaline (Schorl)
Schorl (Na(Fe^2+)3Al6(Si6O18)(BO3)3)(OH)3(OH))
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
Green Quartz (Prasiolite/Adventurine)
Silicon Dioxide with inclusions (SiO2)
Carnelian and White Quartz Bracelet
Silicon Dioxide (SiO2) - specifically Carnelian (Chalcedony) and Rock Crystal/Snow Quartz
Sedimentary rock with quartz veining
Laminated siltstone or mudstone with hydrothermal quartz veins
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Gold Ore in Quartz
Auriferous Quartz (Au + SiO2)
Larimar
Pectolite (a blue variety of Pectolite)
Granite
Granite (Felsic Plutonic Rock)
Red Jasper
Silicon Dioxide (SiO2) with Hematite (Fe2O3)
Quartz (Small Fragment)
Silicon Dioxide (SiO2)
Carnelian
Carnelian (a variety of Chalcedony, SiO ₂)
Banded Agate Geode
Silicon Dioxide (SiO2)
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Jasper
Silicon dioxide, SiO2
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Quartz (likely milky/rose quartz variety)
Quartz (SiO2 - Silicon Dioxide)
Dyed Blue Agate
Cryptocrystalline Quartz (SiO2)
Conglomerate (Asphaltic/Anthropogenic)
Clastic sedimentary rock / Bituminous mixture
Amethyst
Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities
Diamond
Pure Carbon (C)
Corundum (Ruby variety)
Aluminium oxide (Al2O3)
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
Tiger's Eye (often misinterpreted as Gold Ore in this context)
Pseudomorph of Quartz after Crocidolite (SiO2)
Serpentine, likely a variety of Chrysoprase (green chalcedony) or a similar translucent green mineral.
Serpentine Group Minerals (e.g., Antigorite, Lizardite) or Chalcedony (SiO2) with nickel impurities for Chrysoprase green.
Ferruginous Quartz (Carnelian-tinted Quartz)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Blue-dyed Quartz Druzy
Silicon Dioxide (SiO2) with artificial pigment