Milky Quartz
Silicon Dioxide (SiO2)
mineral
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
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Serpentinite (Serpentine Rock)
Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.
Metamorphic Rock
Green Granite / Verd Antique
Serpentinite / Metasomatized Peridotite
metamorphic
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz Vein in Matrix / Quartzite
Silicon Dioxide (SiO2) with host rock
metamorphic
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
River Pebble (Grantoid/Quartzite)
Quartz-rich igneous rock (Granitoid)
igneous
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Banded Agate (Tumbled)
Silicon Dioxide (SiO2)
sedimentary
Travertine (Ceramic Tile)
Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Sparkling Druzy Quartz on Matrix
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Banded Jasper
Silicate Mineral (Microcrystalline Quartz / SiO2)
sedimentary
Fossiliferous Rock (likely Dinosaur Fossil in Matrix)
Permineralized Vertebrate Fossil (Calcium Carbonate/Silica replaced bone material)
sedimentary
Chakra Stone Bracelet
Mixed Mineral Assembly (Scoria, Amethyst, Lapis Lazuli, Turquoise/Howlite, Impression Jasper, Tiger's Eye, Carnelian, Red Jasper)
igneous, metamorphic, and sedimentary
Magnetite (potentially Lodestone)
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Granite Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
fossil
Tiger's Eye
Silicified Riebeckite Asbestos (SiO2 with inclusions)
metamorphic
Gold Nugget / Placer Gold
Native Gold (Au)
mineral
Ironstone / Limonite Concretion
Hydrated Iron Oxide Rock (FeO(OH)·nH2O with SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Caribbean Calcite
Calcium Carbonate (CaCO3) with Aragonite (CaCO3)
sedimentary
Mahogany Obsidian
Obsidian with Hematite inclusions (SiO2 + Fe2O3)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite or Magnetite (SiO2 + Fe2O3)
igneous
Granite
Felsic intrusive igneous rock
igneous
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Quartz Druzy Geode
Silicon Dioxide (SiO2) - Crystalline Variety
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
Mineral
Quartz crystal with Pyrite inclusions
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)
mineral
Tiger's Eye / Hawk's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
White Quartz Star
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
gemstone
Sunstone (Feldspar)
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral