Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Category
Meteorite
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Raw Diamond
Diamond (C)
mineral
Peridotite (Dunite)
Peridotite (mostly Olivine: (Mg,Fe)2SiO4)
igneous
Ironstone Concretion
Ferruginous Sandstone / Iron-rich Sedimentary Rock
sedimentary
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Silicon Carbide (Carborundum)
Moissanite (SiC), though mostly synthetic
mineral
Moldavite
Silica glass with small amounts of aluminum, iron, and other elements
Mineraloid / Tektite
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Mixed collection of natural stones
Several unidentified lithologies, likely including basalt, granite, quartzite, sandstone, and weathered metamorphic rocks
igneous, metamorphic, sedimentary
Ironstone Nodules (Limonite/Hematite)
Goethite/Hematite mix (FeO(OH)/Fe2O3)
sedimentary
Concretion
Calcareous or ferruginous concretion
sedimentary
Sandstone Concretion
Ferruginous Sandstone Concretion
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron oxide concretion (contains FeO(OH)·nH2O)
sedimentary
Iron Slag
Anthropogenic Vitreous Silicate (Byproduct of Smelting)
Mineral-like byproduct
Iron Slag
Anthropogenic Iron Silicate
industrial byproduct
Ferruginous Siltstone or Mudstone
Ferruginous Siltstone / Goethitic Sandstone
sedimentary
Ironstone Concretion
Limonitic/Hematitic Concretion
sedimentary
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Sandstone Concretion
Ferruginous Sandstone Concretion (SiO2 + FeO(OH))
sedimentary
Ironstone Nodule (Ironstone Concretion)
Siderite-rich Mudstone (FeCO3) or Limonite (FeO(OH)·nH2O)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Slag
Anthropogenic Vitrophyre (Iron or Smelting Slag)
Mineral-like byproduct
Limonite Concretion
Goethite-Limonite (FeO(OH)·nH2O)
sedimentary
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
Slag (Industrial Glassy Byproduct)
Anthropogenic silicate byproduct (Slag)
Mineral-like byproduct (often mistaken for igneous rock or meteorite)
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Limestone Concretion (Botryoidal/Calcareous Nodules)
Calcium Carbonate Concretion (CaCO3)
sedimentary
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