Limonite Concretion
Limonite (FeO(OH)·nH2O)
sedimentary
Category
Mineral, Specifically An Iron Ore
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Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Ferrosilicon Slag (Industrial Vitrified Glass)
Vitreous Silicate Residue
Antropogenic (Man-made industrial byproduct)
Green Jasper
Silicon Dioxide (SiO2) with iron silicate inclusions
sedimentary
Limonite (Iron Ore / Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite (Carved as a Horned Skull)
Calcium Carbonate (CaCO3)
mineral
Fuchsite
Chromium-rich Muscovite Mica
mineral
Possibly raw hematite or magnetite
Hematite (Fe₂O₃) or magnetite (Fe₃O₄)
mineral
Raw Citrine (Yellow Quartz)
Citrine / Silicon Dioxide (SiO2)
mineral
Specular hematite (specularite)
Hematite, iron(III) oxide (Fe₂O₃), micaceous/specular variety
mineral
Limonite/Goethite on Shale
Hydrous ferric oxides (FeO(OH)·nH2O) often associated with argillaceous rock
sedimentary
Moss Agate
Chalcedony (Silicon Dioxide / SiO2)
mineral
Red Hematite (Iron Ore)
Hematite (Fe2O3)
mineral
Iron-stained quartz-rich sulfide ore (probable gold-bearing quartz vein)
Quartz (SiO₂) with iron oxides/hydroxides, chiefly hematite–goethite; possible pyrite remnants
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Limonite / Ironstone Concretion
Hydrated Iron Oxide (FeO(OH)%C2%B7nH2O)
sedimentary
Limonite / Goethite Ironstone
FeO(OH)·nH2O (Hydrous iron oxide)
mineral
Specular Hematite
Iron Oxide (Fe2O3)
mineral
Amethyst (Chevron or Banded variety)
Silicon Dioxide with Iron impurities (SiO2)
mineral
Banded Iron Formation
Banded Iron Formation (BIF)
sedimentary
Limonite Concretion
Hydrated Iron Oxide-Hydroxide, FeO(OH)·nH2O
mineral
Limonite (Ironstone Concretion)
Limonite (Hydrated iron(III) oxide-hydroxide, mixtures of FeO(OH)·nH2O)
sedimentary
Feldspar (specifically Orthoclase or Plagioclase)
Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate
mineral
Polished hematite-rich ironstone
Hematite (Fe₂O₃), likely in a magnetite/goethite-bearing ironstone matrix
mineral
Turquoise and Hematite
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)
mineral
Limonite (Gossan)
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Limonite (Ironstone)
Hydrous ferric oxides (FeO(OH)·nH2O)
mineral
Limonite Geode (Ironstone Concretion)
Goethite/Limonite FeO(OH)·nH2O
sedimentary
Dark rock/mineral fragment
Undetermined; possibly magnetite-rich basalt or iron sulfide
mineral
Magnetite / Hematite mix
Magnetite (Fe3O4) and Hematite (Fe2O3)
mineral
Iron-rich laterite or limonite/goethite concretion
Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)
mineral
Iron-rich ochre (red/brown hematite pigment)
Hematite, Fe₂O₃, likely mixed with clay and quartz grains
mineral
Amethyst (Chevron Amethyst)
Amethystine Quartz (SiO2)
mineral
Multi-Gemstone Quartz Bracelet (Amethyst, Aventurine, Rose Quartz, Clear Quartz)
Silicon Dioxide (SiO2) mixture
gemstone
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Botryoidal hematite-rich iron ore (probable)
Hematite, Fe₂O₃, possibly mixed with goethite/limonite
mineral
Dragon Stone (Dragon Blood Jasper)
Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Red-brown iron-rich mineral specimen, likely hematite/goethite
Hematite (Fe₂O₃), possibly mixed with goethite (FeO(OH)) and iron oxides
mineral
Green Jasper
Jasper (variety of Microcrystalline Quartz, SiO2)
sedimentary
Jasper (Red Jasper)
Jasper (Silicon Dioxide, SiO2)
mineral