Slag (Industrial Byproduct)
Ferrous/Non-ferrous Silicate
igneous (artificial/anthropogenic)
Category
Meteorite
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Ferruginous Slag (Iron Smelting Byproduct)
Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)
Antropogenic Glass / Mineraloid
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4 in Vesicular Basalt
igneous
Olivine (Peridot in gem form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Iron Slag
Vitreous glassy waste (Fe-Si-Al-Ca compounds)
Mineral byproduct (anthropogenic / techno-fossil)
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)
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Peridot (Olivine)
Olivine (Magnesium Iron Silicate), (Mg,Fe)2SiO4
mineral
Slag
Glassy silicate byproduct (anthropogenic material)
industrial byproduct
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Ironstone Concretion / Limonite Node
Limonite (Hydrated Iron Oxide, FeO(OH)·nH2O) with Goethite/Hematite
sedimentary
Faceted yellow-green gemstone, likely peridot
Olivine, typically forsterite-rich (Mg₂SiO₄)
gemstone
Bronzite
Enstatite (var. Bronzite), (Mg,Fe)SiO3
mineral
Polished peridot (olivine) cabochon
Olivine, typically forsterite-rich: (Mg,Fe)₂SiO₄
gemstone
Weathered porphyritic basalt
Basalt, likely plagioclase-phyric basalt; primarily a fine-grained aggregate of plagioclase feldspar, clinopyroxene, and possibly olivine or iron-titanium oxides
igneous
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Blue slag glass / industrial smelter slag
Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases
mineral
Ironstone Concretion (Ironstone Gourd)
Limonite/Goethite Concretion (FeOO(H))
sedimentary
Iron Slag (Industrial Byproduct)
Anthropogenic Vitrification Product/Ferrous Slag
Mineral-like Industrial Smelting Waste
Sandy Ironstone
Ferruginous Sandstone
sedimentary
Iron-rich chert or weathered ironstone
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides, possibly hematite/goethite
sedimentary
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Likely slag or metallic industrial byproduct
Unidentified iron-rich ferrous slag; possibly magnetite-bearing slag
mineral
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Iron Slag
Ferrous Slag (complex silicate and oxide byproduct)
industrial byproduct (anthropogenic)
Slag
Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)
igneous (artificial/anthropogenic)
Rainbow carborundum (silicon carbide)
Silicon carbide, SiC; commonly synthetic moissanite/carborundum specimen
mineral
Peridot gemstone pendant
Olivine, gem-quality forsteritic olivine (approximately (Mg,Fe)₂SiO₄)
gemstone
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Ironstone Concretion / Limonite Node
Goethite / Limonite (FeO(OH)·nH2O)
sedimentary
Shiva Lingam
Cryptocrystalline Quartz (Jasproid/Sandstone) with Iron Oxide (Fe2O3)
sedimentary
Industrial Slag
Anthropogenic Vitreous Slag
igneous
Likely weathered basalt
Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar and pyroxene, with possible olivine and iron oxides
igneous
Ironstone Concretion / Hematite Nodules
Ferruginous Sedimentary Rock (primarily Hematite Fe2O3 and Goethite FeO(OH))
sedimentary
Nickel
Nickel (Ni)
mineral
Sandstone (specifically an Iron-Concretion)
Arenite with Iron Oxide (Limonite/Goethite) cementation
sedimentary
Ferrochrome Slag
Industrial Glassy Slag (Fe-Cr alloy byproduct)
Antropogenic (Man-made industrial byproduct)
Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
mineral
Ironstone Concretion
Siderite or Hematite Concretion
sedimentary
Ironstone Concretion (Limonite/Goethite)
Ferruginous concretion (Fe2O3·nH2O)
sedimentary
Carborundum
Silicon Carbide (SiC)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral