Small cylindrical mineral/stone fragment
Undetermined; the image is insufficient for reliable mineral identification
mineral
Category
Mineral (Refined Metal)
Browse mineral (refined metal) specimens identified by the Rock Identifier community.
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Basalt with Quartz Vein
Basalt (fine-grained mafic igneous rock) with crystalline Quartz (SiO2)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Metasedimentary or Igneous matrix
mineral
Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Opalite
Synthetic glass / Opaque silicious glass
gemstone
Granite
Plutonic Igneous Rock
igneous
Clear faceted gemstone in an ornate metal bracelet
Unidentified transparent faceted stone; possibilities include quartz (SiO₂), zircon (ZrSiO₄), or glass—image alone cannot distinguish them
gemstone
Vanadinite
Vanadinite (Pb5(VO4)3Cl)
mineral
Granite (with Beryl/Aquamarine)
Granite (Feldspar, Quartz, Mica, and Beryl Be3Al2Si6O18)
igneous
Unidentified dark mineral/rock fragment
Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral
mineral
Likely carnelian ring stone
Carnelian, orange-red variety of chalcedony (microcrystalline quartz, SiO₂)
gemstone
Lepidolite on Matrix
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Serpentine
(Mg,Fe)3Si2O5(OH)4
metamorphic
Green aventurine pendant
Quartz variety, SiO₂, colored mainly by fuchsite or other chromium-bearing mica inclusions
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Limonite (Iron Stone/Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Slag
Ferrous slag (by-product of iron smelting)
Mineraloid / Anthropogenic
Native Copper with Malachite/Oxide Coating
Native Copper (Cu)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Bauxite
Bauxite (Al2O3·2H2O mixed with iron oxides)
sedimentary
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Clear quartz pendant
Quartz (silicon dioxide, SiO₂)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Bismuthinite with Chalcopyrite and Quartz
Bismuthinite (Bi2S3) and Chalcopyrite (CuFeS2)
mineral
Granite
Intrusive igneous rock
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb,Cs)4O10(F,OH)2
mineral
Bornite
Cu5FeS4
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Copper Ore with Malachite and Chrysocolla
Cu2CO3(OH)2 (Malachite) with Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla)
mineral
Quartz Vein in Pelite (Metamorphic Rock)
Hydrothermal Quartz Veining in Metasedimentary Rock (SiO2)
metamorphic
Tourmalinated Quartz
Silicon dioxide with sodium aluminum borosilicate (SiO2 + Na(Al,Fe,Li)3Al6(BO3)3Si6O18(OH)4)
mineral
Marble
Recrystallized Calcite (CaCO3)
metamorphic
Purple fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Bauxite
Bauxite (Al(OH)3, AlO(OH), AlOOH)
sedimentary
Bauxite
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Copper Ore
Chalcopyrite in host rock (CuFeS2)
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Copper Ore (likely Malachite or Chrysocolla staining)
Copper Secondary Mineral (e.g., Cu2CO3(OH)2)
mineral