Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Category
Mineral (Native Element Alloy)
Browse mineral (native element alloy) specimens identified by the Rock Identifier community.
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
sedimentary
Granite
Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Basalt with Quartz Vein and Weathering Crust
Amygdaloidal or Porphyritic Basalt
igneous
Healer's Gold (Pyrite and Magnetite in Schist)
Magnetite (Fe3O4) and Pyrite (FeS2) in Mica Schist
metamorphic
Mica (specimen appears to be Muscovite or Phlogopite)
Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2
Mineral (Found in Igneous and Metamorphic rocks)
Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Amethyst Quartz Pebble
Silicon Dioxide (SiO2) with iron impurities
mineral
Aquamarine on Feldspar Matrix
Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
White Marble
Recrystallized Calcite (CaCO3)
metamorphic
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Lapis Lazuli (Tumbled Stone)
Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)
metamorphic
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Ironstone Concretion (Limonite/Hematite Nodules)
Ironstone (principally Limonite FeO(OH)·nH2O or Hematite Fe2O3 mixed with silica/clay)
sedimentary
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Goethite inclusions
mineral
Banded Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (SiO2 with Iron Oxide impurities)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Schorl (Black Tourmaline) in Pegmatite
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
igneous
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Limonite and Goethite (Ironstone)
Hydrous Iron Oxide Mixture (FeO(OH)·nH2O)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Red Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye
mineral
Jasper with Manganese Dendrites
Silicon Dioxide (SiO2) with Oxide Mineral Inclusions
sedimentary
Brecciated Chert
Sedimentary Chert (SiO2) with Calc-Silicate mineralization
sedimentary
Jasper (var. Ocean or Polychrome Jasper)
Silicon Dioxide (SiO2) with iron and mineral inclusions
sedimentary
Amazonite
Amazonite (KAlSi3O8); a green variety of Microcline feldspar
mineral
Yellow Ocher (Limonite)
Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O
mineral
Rutilated Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2 with Epidote/Tourmaline inclusions
mineral
Garnet
Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)
mineral
Amethyst
Quartz (SiO2) with trace iron impurities
Mineral