Magnetite
Magnetite (Fe3O4)
Mineral
Category
Mineral (Primary Constituent)
Browse mineral (primary constituent) specimens identified by the Rock Identifier community.
Chrome Diopside
Diopside (Magnesium Calcium Silicate) - CaMgSi2O6 + Cr
mineral
Bog Iron (Limonite)
Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)
sedimentary
Quartz (Milky/Common)
Silicon Dioxide (SiO2)
mineral
Green Calcite
Calcite (CaCO3)
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Banded Iron Formation (BIF) / Tiger Iron variety
Banded Iron Formation (predominantly Hematite, Magnetite, and Chert/Quartz - SiO2 + Fe2O3)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Rough Diamond
Diamond (Native Carbon), C
mineral
Gold Nugget
Native Gold (Au)
mineral
Basalt (Greenstone)
Amygdaloidal Basalt / Chloritized Basalt
Igneous
Basalt with minor mineral crusting
Sideromelane / Extrusive Igneous Rock
igneous
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
metamorphic
Smoky Quartz and Biotite Schist
Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Epidote in Granite Gneiss
Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Bauxite
Bauxite (Principal ore of aluminum; mixture of minerals including Gibbsite Al(OH)3, Boehmite and Diaspore AlO(OH))
sedimentary
Mookaite Jasper
Silicified Radiolarite (Silicon Dioxide: SiO2)
sedimentary
Howlite
Howlite (Calcium borosilicate hydroxide: Ca2B5SiO9(OH)5)
mineral
Rough Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Quartz (Citrine Quartz or Yellow Jasper)
Silicon Dioxide (SiO2) with iron impurities
mineral
Calcite
Calcite (Mineral, Calcium Carbonate - CaCO3)
Mineral
Basalt (Crushed Stone Aggregate)
Mafic Volcanic Basalt (Major Minerals: Plagioclase Feldspar, Pyroxene, Olivine)
igneous
Citrine
Silicon Dioxide (SiO2) - Macrocrystalline Quartz variety
mineral
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Lepidolite in Quartz (Lithium-bearing Ore)
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) and Quartz (SiO2)
igneous/mineral
Magnetite
Magnetite (Iron(II,III) oxide, Fe3O4)
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Geode with Iron-Stained Quartz/Calcite
Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix
sedimentary
Fluorite-Gedrite in Quartz (Schist)
Fluorite (CaF2) with Gedrite in Quartz/Feldspar Matrix
metamorphic
Limonite-stained Chert
Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)
sedimentary
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Jadeite
Jadeite (NaAlSi2O6)
metamorphic
Galena
Lead(II) sulfide (PbS)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Shale (sub-type: Carbonaceous Shale)
Lutaceous Sedimentary Rock
sedimentary
Ferruginous Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2) with iron oxide inclusions/staining (Limonite/Hematite)
Mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Calcite
Calcium Carbonate (CaCO3)
mineral
Blue Lace Agate (Geode/Druzy variant)
Chalcedony (SiO2) with Quartz druzy
mineral