Limonite Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
sedimentary
Category
Mineral, Specifically An Iron Ore
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Specular Hematite with Pyrite
Iron Oxide (Fe2O3) with Iron Sulfide (FeS2)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Iron-rich weathered rock fragment
Indeterminate; likely limonite/goethite-bearing sandstone or lateritic ironstone
mineral
Iron-rich sandstone or ironstone fragments
Ferruginous sandstone; chiefly quartz (SiO₂) cemented or stained by iron oxides such as hematite (Fe₂O₃) and goethite (FeO(OH))
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Possible iron-rich stone or meteorite fragment
Undetermined; possibly magnetite-bearing rock or an ordinary chondrite
mineral
Dragon Stone (Dragon Blood Jasper)
Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Limonite and Goethite encrusted Chert/Ironstone
Hydrated Iron Oxide (FeO(OH)·nH2O) with cryptocrystalline Silica (SiO2)
sedimentary
Dream Amethyst (Chevron Amethyst)
Silicon Dioxide (SiO2) with iron impurities and gamma radiation exposure
Mineral
Quartz (specifically Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Specular Hematite (Iron Ore)
Hematite (Alpha-Fe2O3)
mineral
Gossanous Sandstone (likely Terrestrial)
Arenite with Iron-Oxide inclusions
sedimentary
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Magnetite / Hematite (Iron Ore)
Magnetite (Fe3O4) or Hematite (Fe2O3)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Hematite
Hematite (Fe2O3)
mineral
Gossan (Iron Hat)
Gossan (secondary iron oxide cap)
sedimentary
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2)
mineral
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Hematite
Iron oxide (Fe2O3)
mineral
Limonite (Ironstone)
Hydrated Iron(III) Oxide-hydroxide (FeO(OH)·nH2O)
sedimentary
Hematite
Iron(III) oxide (Fe2O3)
mineral
Hematite
Hematite (Fe2O3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Likely ironstone or weathered iron-rich rock
Hematite/goethite-bearing ferruginous concretion; exact identification requires testing
mineral
Yellow Agate
Silicon Dioxide (SiO2)
mineral
Botryoidal hematite–goethite specimen (probable)
Hematite (Fe₂O₃) with goethite (FeO(OH)), possibly limonite
mineral
Blue Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Slag
Metallurgical Slag
igneous
Vesicular Basalt (Scoria)
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) in Altered Host Rock
mineral
Specular Hematite
Iron(III) oxide (Fe2O3)
mineral
Ironstone Concretion (Siderite Nodules)
Siderite (FeCO3) in Mudstone or Sandstone matrix
sedimentary
Bauxite
Aluminum ore / Hydrated aluminum oxides
sedimentary
Limonite with Quartz
FeO(OH)·nH2O (Limonite) with SiO2 (Quartz)
mineral
Basalt (Tumbled Massage Stone)
Extrusive Igneous Rock
igneous