Biotite-bearing metamorphic rock, likely gneiss or schist
Mica-rich quartz–feldspar gneiss/schist; exact identification requires testing
metamorphic
Category
Mineral (Refined Metal)
Browse mineral (refined metal) specimens identified by the Rock Identifier community.
Learn about Mineral (Refined Metal) in the encyclopedia
View all →
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Granite
Phaneritic felsic intrusive igneous rock
igneous
Amethyst
Quartz (Silicon Dioxide, SiO2)
gemstone
Metallic sulfide-bearing rock, likely galena-rich ore
Galena (lead sulfide, PbS), possibly mixed with pyrite/chalcopyrite and host rock
mineral
Quartz Vein in Basalt or Mafic Rock
Silicon Dioxide (SiO2) vein in volcanic/mafic matrix
igneous
Lepidolite
K(Li,Al)3(Al,Si,Rb,Cs)4O10(F,OH)2
mineral
Lepidolite
K(Li,Al)3(Si,Al)4O10(F,OH)2
mineral
Silicon Carbide
Silicon Carbide (Moissanite / Carborundum), SiC
mineral
Opalite
Synthesized glass / Silicon dioxide
gemstone
Aura Quartz (Titanium/Gold coated)
Silicon Dioxide (SiO2) with metallic vapor deposition
mineral
Copper Ore
Cupriferous rock mixture (contains Chalcopyrite and Bornite)
igneous
Lepidolite
K(Li,Al)3(Al,Si,4)10(O,F,OH)2
mineral
Ironstone Pebble
Sedimentary ironstone / Hematitic Sandstone
sedimentary
Chalcopyrite in Quartz (Gold-bearing Ore)
CuFeS2 (Chalcopyrite)
mineral
Granite
Intrusive Igneous Rock
igneous
Granite
Plutonic Igneous Rock
igneous
Limonite (Ochreous)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Turquoise-colored bead on a metal earring
Unidentified blue-green bead; possibly turquoise (CuAl₆(PO₄)₄(OH)₈·4H₂O), but the image cannot confirm its material
gemstone
Vanadinite
Pb5(VO4)3Cl
mineral
Quartz vein in Schist
Crystalline Silicon Dioxide (SiO2) in Metamorphic Host
metamorphic
Red garnet cabochon pendant
Likely almandine garnet, iron-rich garnet-group silicate (often approximated as Fe₃Al₂(SiO₄)₃); identification from the image is uncertain.
gemstone
Granite
Intrusive Igneous Rock
igneous
Quartz Vein in Basalt or Sedimentary Host Rock
Silica-veined lithic fragment (SiO2 in host matrix)
sedimentary
Olivine
(Mg,Fe)2SiO4
mineral
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Milky Quartz with Mica Matrix
SiO2 (Silicon Dioxide) with Muscovite/Biotite mica
mineral
Granite
Intrusive igneous rock primarily composed of quartz, alkali feldspar, and plagioclase
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Gabbro (likely with Pyrite/Sulfide mineralization)
Mafic Intrusive Igneous Rock
igneous
Dendritic Agate
Silicon Dioxide (Chalcedony with manganese or iron oxide inclusions)
gemstone
Faceted clear gemstone in a metal setting
Unidentified transparent faceted gem; possibilities include quartz (SiO₂), topaz (Al₂SiO₄(F,OH)₂), or glass—the image is insufficient for identification.
gemstone
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Granite
Intrusive Igneous Rock
igneous
Red jasper (likely polished and carved)
Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides
gemstone
Aura Quartz (Coated Quartz)
Silicon Dioxide (SiO2) treated with metallic vapor
mineral
Aura Quartz Bead
Silicon dioxide (SiO2) with metal coating
mineral with artificial coating
Likely chrysocolla-bearing copper ore
Chrysocolla, a hydrated copper silicate; exact identification is uncertain from the small, blurry image
mineral
Pyrite with Quartz
Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)
mineral
Granite
Intrusive Igneous Rock (composed primarily of quartz, alkali feldspar, and plagioclase)
igneous