Native Gold Nugget
Native Gold (Au)
mineral
Category
Mineral (Refined Metal)
Browse mineral (refined metal) specimens identified by the Rock Identifier community.
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Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite/Sepiolite inclusions
gemstone
Iron Slag
Anthropogenic Iron oxide/Silicate composite
Mineral-like byproduct (Technogenic)
Amethyst (as seen in jewelry)
Amethyst (Silicon Dioxide SiO2 + Fe4+)
mineral
Diamond
Carbon (C)
mineral
Pyrite in Gossan
Iron Sulfide (FeS2) in Ferruginous Rock
mineral
Goldstone
Avventurina (Cu + SiO2 glass)
mineral
Quartzite
Silica (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Granite
Plutonic Igneous Rock (composed primarily of Quartz, Feldspar, and Mica)
igneous
Silver (Jewelry Specimen)
Native Silver (Ag)
Mineral (Native Element)
Quartzite
Quartzite (primarily SiO2)
metamorphic
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Milky Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Quartzite with Iron Hydroxide Staining
Quartzite (primarily SiO2) with Limonite/Goethite staining
metamorphic
Chert Nodule
Microcrystalline Silica (SiO2)
sedimentary
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Quartz Vein in Granite
Crystalline Silicon Dioxide (SiO2) in Granitic Matrix
mineral/igneous
Gold and Silver (in jewelry form)
Gold (Au) and Silver (Ag)
mineral
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Gossan (Iron Hat)
Goethite-Hematite rich weathered rock (Fe-hydroxides)
sedimentary
Diorite
Intermediate intrusive igneous rock
igneous
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Hematite (Iron Ore Boulder)
Hematite (Fe2O3)
mineral
Banded Flint (Polished Stripe Flint)
Silicon Dioxide (SiO2) - variety of Chert
sedimentary
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Vesicular basalt (weathered lava rock)
Basalt; primarily plagioclase feldspar, pyroxene, and commonly olivine (mafic volcanic rock)
igneous
Chert (specifically Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Likely weathered basalt or mafic volcanic rock
Basalt; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Quartz-rich pegmatite with green mica or chlorite
Granitic pegmatite; chiefly quartz (SiO₂), with feldspar and probable muscovite/chlorite
igneous
Diamond (in a jewelry setting)
Carbon (C)
mineral
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Serpentinite
Serpentinite (composed primarily of minerals in the Serpentine group)
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Mystic Topaz
Al2SiO4(F,OH)2 (Coated)
gemstone
Pyrite
Iron Disulfide (FeS2)
mineral
Goldstone (Red)
Aventurine Glass
Man-made material (Simulated Mineral)
Dyed blue howlite (turquoise imitation), possibly dyed magnesite
Howlite: Ca₂B₅SiO₉(OH)₅; the vivid blue color is artificial dye. Exact identification is uncertain from the photograph alone.
gemstone
Onyx
Chalcedony (SiO2) with parallel banding
mineral
Banded Black Onyx (Chalcedony)
Silicon Dioxide (SiO₂)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (containing secondary minerals like Quartz, Zeolites, or Calcite)
igneous