Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Category
Igneous And Mineral
Browse igneous and mineral specimens identified by the Rock Identifier community.
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Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Quartz Geode (with possible Manganese or Goethite coating)
Silicon Dioxide (SiO2)
mineral
Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Mineral
Pyrite-bearing quartz vein rock
Pyrite (FeS₂) with quartz (SiO₂), likely in a schistose or altered host rock
mineral
Quartz Geode
Crystalline Silicon Dioxide (SiO2) in Geode form
mineral
Man-made Green Quartz (Lab-grown or Treated)
Silicon Dioxide (SiO2) with artificial coloration
mineral
Basalt and Quartz pebbles
Basalt (extrusive igneous rock) and Quartz (SiO2)
igneous and mineral
Tumbled Black Stone
Unknown, possibly Obsidian, Onyx, or Tourmaline
igneous or mineral
Obsidian and Phantom Quartz
Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)
igneous and mineral
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Quartz with Mica/Chlorite inclusions
Silicon Dioxide (SiO2) with phyllosilicate inclusions
igneous/metamorphic mineral specimen
Jasper (specifically Polychrome or Desert Jasper)
Silicon Dioxide (SiO2) with impurities
sedimentary or igneous-associated mineral
Quartz Vein in Gneiss or Basalt
Milky Quartz (SiO2) within Metamorphic Host Rock
Metamorphic or Igneous with Mineral Inclusion
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Amethyst and Smoky Quartz (Tumbled)
Silicon Dioxide (SiO2) with trace impurities iron (Amethyst) and aluminum/radiation (Smoky Quartz)
mineral
Gold Nugget / Placer Gold
Native Gold (Au)
mineral
Clear quartz crystal
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Polished clear quartz cabochon
Quartz (silicon dioxide, SiO₂)
mineral
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Peach Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Likely rough rose quartz
Quartz, silicon dioxide (SiO₂), with pink coloration
mineral
Milky quartz with iron staining
Quartz (SiO₂), likely massive vein quartz
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Tumbled milky quartz
Quartz (SiO₂), likely translucent white variety
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Likely rose quartz
Quartz (SiO₂), variety rose quartz
mineral
Biotite mica (likely)
Biotite, a mica-group mineral; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Tumbled milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Tumbled milky quartz
Quartz (SiO₂), likely milky quartz
mineral
Tumbled milky quartz
Quartz (SiO₂), likely massive milky quartz
mineral
Mixed collection of quartz-rich rocks and minerals
Quartz (SiO₂), with some pieces possibly containing feldspar or mica; exact identification is uncertain from the image
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Tumbled smoky quartz
Quartz (SiO₂), smoky variety
mineral
Likely smoky quartz or quartz-rich tumbled fragment
Quartz, silicon dioxide (SiO₂), possibly smoky quartz
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Moonstone (Tumbled)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Albite
mineral
Tumbled smoky quartz
Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Likely magnetite-rich rock (lodestone)
Magnetite, Fe₃O₄, possibly in a fine-grained host rock
mineral