Chert (Iron-stained)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Mineral (Processed Metal)
Browse mineral (processed metal) specimens identified by the Rock Identifier community.
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Hollow geode or vesicular volcanic rock
Likely quartz-lined basaltic/andesitic vesicle; exact identification requires testing
igneous
Turquoise color-bead and Hematite necklace
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Diamond (in a jewelry setting)
Cubic Carbon (C)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Bauxite (Aluminum Ore)
Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)
sedimentary
Tiger Iron
Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)
metamorphic
Granite
Intrusive Igneous Rock
igneous
Likely weathered mafic rock (basalt or gabbro)
Basalt–gabbroic rock; chiefly plagioclase feldspar, pyroxene, and possibly olivine
igneous
Granitic Pegmatite
Pegmatite (Quartz: SiO2, Feldspar: KAlSi3O8, Mica: KAl2(AlSi3O10)(OH)2)
Igneous
Bull Quartz (White Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite-bearing Rock
Iron Sulfide (FeS2) associated with host rock
mineral
Granite
Intrusive Igneous Rock
igneous
Beryl (likely Aquamarine or Heliodor variant)
Beryllium aluminum cyclosilicate (Be3Al2Si6O18)
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Quartz Veinated Sandstone or Siltstone
Silicon Dioxide (SiO2) within a clastic sedimentary matrix
sedimentary
Gold
Native Gold (Au)
mineral
Gold
Native Gold (Au)
mineral
Bauxite
Aluminium ore consisting largely of the minerals gibbsite Al(OH)3, boehmite γ-AlO(OH) and diaspore α-AlO(OH)
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Slag
Metallurgical by-product
Anthropogenic (Man-made material)
Copper Ore
Cupriferous Rock / Mixed Mineral Matrix
igneous
Rounded greenish-gold rock or mineral pebble
Indeterminate; possibly serpentine-rich stone, weathered sulfide, or iron-stained metamorphic rock
mineral
Diamond (in a gold setting)
Carbon (C)
mineral
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Quartz-rich hydrothermal mineral specimen, possibly vanadinite-bearing matrix
Quartz (SiO₂) with unidentified red-brown accessory minerals; exact species requires testing
mineral
Manganese Oxide Crust on Limestone
Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,3O10)(F,OH)2
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Decorative gemstone bracelet or jewelry
Unidentifiable from the blurred image; likely colored glass or synthetic stones, possibly mixed gemstone beads
gemstone
Granite
Intrusive igneous rock
igneous
Gossan
Iron-rich regolith (mainly Limonite and Goethite, FeO(OH)·nH2O)
sedimentary
Quartz / Calcite Vein Rock
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)
mineral
Likely native metallic mineral specimen
Uncertain from photograph; possibly pyrite (FeS₂) or a sulfide-rich metallic ore
mineral
Granite
Intrusive igneous rock (Felsic)
igneous
Sandstone (Red Flagstone)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Native Copper
Native Copper (Cu)
mineral