Pyrite
Iron Disulfide (FeS2)
mineral
Category
Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)
Browse metamorphic rock (for nephrite and some jadeite); mineral (for jadeite) specimens identified by the Rock Identifier community.
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz - SiO2)
sedimentary
Basalt River Stone
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Ironstone Concretion / Limonite Node
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O) with Goethite/Hematite
sedimentary
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Carnelian Agate
Silicon Dioxide with Iron Oxide impurities (SiO2)
mineral
Granitic Pegmatite
Phaneritic Granite with Potassium Feldspar (KAlSi3O8), Quartz (SiO2), and Plagioclase
igneous
Smoky Quartz on Matrix
Silicon Dioxide (SiO2) with trace impurities and aluminum inclusions
mineral
Obsidian
Volcanic glass (SiO2-rich extrusive igneous rock)
igneous
Indian Agate
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Basalt
Mafic volcanic rock (primarily Plagioclase and Pyroxene)
igneous
Granitic Pegmatite
Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)
igneous
Granodiorite / Granite
Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)
igneous
Shungite
Carbonaceous rock (primarily amorphous carbon)
Mineraloid
Blue Lace Agate (Geode/Druzy variant)
Chalcedony (SiO2) with Quartz druzy
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
Igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (Septarian or Nodular variety)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Basalt
Basalt (Mafic Extrusive)
igneous
Metal Chain Belt with Square Plates
Not applicable (man-made)
Man-made Object (Metalwork)
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Ferruginous Quartz (Agatized/Iron-stained Quartzite)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
metamorphic
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Limonite
Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)
Mineral
Citrine
SiO2 (Silicon Dioxide)
mineral
Aquamarine on Feldspar Matrix
Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Amazonite
Amazonite (KAlSi3O8 - a variety of Microcline Feldspar)
Mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Carnelian
Chalcedony (cryptocrystalline quartz), SiO2
Mineral
Larimar
Pectolite (a blue variety of Pectolite)
Mineral
Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granitic Pegmatite
Coarse-grained Granite (KAlSi3O8 + SiO2)
igneous
Citrine
Silicon Dioxide (SiO2)
mineral
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Slag (Industrial Glassy Byproduct)
Ferro-silicate Slag
Anthropogenic / Non-Natural
Biotite on Matrix
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral