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
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
Black Obsidian and Hematite
Volcanic Glass (SiO2) and Hematite (Fe2O3)
igneous and mineral
Obsidian and Phantom Quartz
Volcanic Glass (SiO2 + MgO + Fe3O4) and Crystalline Quartz (SiO2)
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
Citrine
Crystalline Quartz (SiO2) with iron impurities
mineral
Peach Moonstone
Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)
mineral
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Si,Al)3O8
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Moonstone (Tumbled)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Albite
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Moonstone
Orthoclase/Albite (KAlSi3O8 / NaAlSi3O8) with Adularescence
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in matrix
mineral
Citrine (likely Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Snowflake Obsidian and Green Aventurine
Volcanic Glass (SiO2 with Cristobalite inclusions) and Quartz (SiO2 with Fuchsite)
igneous and metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Calcite
Calcite (CaCO₃, Calcium Carbonate)
Mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Basalt
Basalt
Igneous
Magnetite Ore
Magnetite (Fe3O4)
mineral
Magnetite (Lodestone variety)
Magnetite (Fe3O4)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Magnetite Sand (Black Sand)
Magnetite (Fe3O4)
mineral
Granite with Epidote
Granite, containing quartz, feldspar, and epidote
Igneous
Magnetite
Magnetite (Fe3O4)
mineral
Blue Apatite
Apatite (Group), Ca5(PO4)3(F,Cl,OH)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral