Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
Category
Meteorite
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Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Peridotite (Dunite)
Peridotite (comprising mainly Olivine)
igneous
Olivine (Peridotite)
Magnesium iron silicate (Mg, Fe)2SiO4
igneous
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Diamond
Diamond (Pure Carbon, C)
mineral
Slag (Industrial Glass Slag)
Amorphous Silica / Ferro-silicate Slag
mineraloid / anthropogenic
Olivine
Olivine group (Mg, Fe)2SiO4
mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC) / Moissanite (natural)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
Mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Ferruginous Sandstone (Ironstone Nodules)
Ferruginous Quartz-Arenite (with Goethite/Hematite cement)
sedimentary
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Ironstone Concretion (Limonite/Goethite)
Goethite-rich Concretion (FeO(OH))
sedimentary
Ironstone concretion / Limonitic Sandstone
Goethite/Hematite Cemented Sandstone (Hydrated Iron Oxide)
sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
sedimentary
Olivine (Peridot)
Olivine Group (Mg,Fe)2SiO4
mineral
Diamond (Faceted)
Diamond (Carbon, C)
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Slag (Industrial By-product)
Anthropogenic Vitreous Silica/Iron Silicate
mineral
Limonite Concretion
Limonite (Hydrated Iron Oxide) FeO(OH)·nH2O
sedimentary
Peridot (likely, based on color and appearance)
Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)
Mineral
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Sandstone / Ironstone (FeO(OH)·nH2O)
sedimentary
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Ferruginous Sandstone with Ironstone Concretion
Goethite-rich Sandstone (FeO(OH))
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Olivine (Peridot when gem-quality)
Magnesium Iron Silicate, (Mg,Fe)2SiO4
Mineral
Limonite (Iron Stone/Goethite)
Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))
mineral
Ironstone Concretion (Iron-rich Mudstone)
Siderite / Geothite concretion (FeCO3 / FeO(OH))
sedimentary
Olivine
(Mg, Fe)2SiO4
Mineral
Olivine (Peridot)
Olivine Group (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
mineral