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
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
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Peach Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Tumbled smoky quartz
Quartz (SiO₂), smoky variety
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Likely smoky quartz or quartz-rich tumbled fragment
Quartz, silicon dioxide (SiO₂), possibly smoky quartz
mineral
Tumbled smoky quartz
Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum
mineral
Moonstone (Tumbled)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Albite
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Polished smoky quartz
Quartz (SiO₂), smoky variety
mineral
Pink amethyst or pale pink quartz gemstone
Quartz, SiO₂; pink coloration may result from microscopic inclusions or irradiation-related defects
gemstone
Weathered Pyrite Nodule
Iron Sulfide (FeS2) undergoing oxidation to limonite/goethite
mineral
Smoky quartz (likely rough or tumbled fragment)
Quartz, silicon dioxide (SiO₂), brown variety colored by irradiation and trace aluminum
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Pink quartz beads (likely rose quartz)
Quartz, SiO₂; pink color commonly from trace inclusions or lattice defects
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Smoky quartz (probable)
Quartz, silicon dioxide (SiO₂), brown smoky variety
mineral
Moonstone
Orthoclase/Albite (KAlSi3O8 / NaAlSi3O8) with Adularescence
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz (rose-tinted quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Faceted brown gemstone pendant, likely smoky quartz or champagne topaz
Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)
gemstone
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Mixed rock and mineral specimens
Multiple unidentified silicate rocks and minerals; likely quartz-bearing material, feldspar, mica, and iron-oxide-bearing stones
mineral
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral