Ironstone (Limonite/Hematite)
Ferruginous sedimentary rock (Fe2O3·nH2O / Fe2O3)
sedimentary
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Weathered iron-rich limestone or marl
Calcitic carbonate rock with limonite/goethite and clay impurities (predominantly CaCO₃)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Weathered iron-rich concretion or ironstone cobble
Goethite–hematite–limonite-rich ironstone; exact identification requires testing
sedimentary
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
mineral
Unidentified dark metallic sulfide specimen
Possibly pyrite-, chalcopyrite-, or galena-bearing ore; exact identification requires testing
mineral
Faceted green gemstone, possibly peridot
Uncertain from the image; peridot is gem-quality olivine, (Mg,Fe)₂SiO₄
gemstone
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Silicon Carbide (Carborundum)
Silicon Carbide (SiC)
mineral
Dark metallic-looking mineral specimen, possibly magnetite
Magnetite (Fe₃O₄), tentative identification
mineral
Goethite / Limonite Concretion
Iron Hydroxide Oxide (FeO(OH))
sedimentary
Sandstone Concretion
Arenaceous concretion (primarily SiO2 with Fe2O3 staining)
sedimentary
Slag
Anthropogenic glassy silicate
Mineral-like byproduct
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Ironstone Concretion (Siderite Nodules)
Siderite (FeCO3) in Mudstone or Sandstone matrix
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Raw Diamond
Diamond (C)
mineral
Peridotite (Dunite)
Peridotite (mostly Olivine: (Mg,Fe)2SiO4)
igneous
Ironstone Concretion
Ferruginous Sandstone / Iron-rich Sedimentary Rock
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
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
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
Iron Slag (Industrial Byproduct)
Anthropogenic pyrometallurgical residue
mineral
Possible tektite or iron-rich slag-like natural specimen
Uncertain; possibly natural glass (tektite) or magnetite-rich rock
mineral
Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Likely polished basalt with pale mineral inclusions
Basalt; inclusions possibly calcite, quartz, or weathered feldspar
igneous
Dark metallic mineral specimen, possibly hematite or magnetite
Hematite (Fe₂O₃) or magnetite (Fe₃O₄); exact identification requires testing
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC)
mineral