Ironstone concretion
Siderite or Limonite concretion (FeCO3 or FeO(OH)·nH2O)
sedimentary
Category
Meteorite
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Ironstone Concretion
Siderite or Hematite-rich Concretion (FeCO3 / Fe2O3)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Olivine
(Mg,Fe)2SiO4
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Martian Meteorite (Black Beauty)
Martian (basaltic breccia) Meteorite, Northwest Africa (NWA) 7034
igneous
Ironstone Concretion
Ferruginous Siltstone/Ironstone (Fe2O3)
sedimentary
Olivine (Peridot Stone)
(Mg, Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Sandstone (Ferruginous Concretion)
Ferruginous Sandstone Concretion / SiO2 with Fe2O3 cement
sedimentary
Faceted green gemstone, likely peridot
Olivine, gem-quality forsteritic olivine: (Mg,Fe)₂SiO₄
gemstone
Weathered sandstone or iron-rich sedimentary rock
Indeterminate siliciclastic rock; likely quartz-rich sandstone with iron-oxide staining
sedimentary
Iron-rich vesicular rock, possibly slag or weathered basalt
Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag
igneous
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Possible basalt or iron-rich river pebble
Fine-grained mafic rock, likely basalt (plagioclase–pyroxene ± olivine, with iron oxides)
igneous
Basalt (likely vesicular basalt)
Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine
igneous
Tektite (Indochinite)
Tektite (Amorphous Silica Glass), SiO2(Al2O3)
igneous
Tektite (Indochinite)
Tektite (Lechatelierite-rich silica glass)
Mineral-like (Natural Glass)
Tektite (Indochinite)
Tektite (High-silica amorphous glass)
igneous
Tektite (Indochinite)
Tektite (High-silica natural glass, primarily SiO2 with Al2O3)
igneous
Tektite
Tektite (high-silica natural glass)
Mineraloid
Weathered iron-rich volcanic rock (probable basalt/scoria)
Basaltic volcanic rock; mainly plagioclase feldspar, pyroxene, and iron oxides
igneous
Ironstone concretion
Siderite or Limonite-rich Concretion (FeO(OH)·nH2O)
sedimentary
Ironstone Concretion
Ferruginous Concretion
sedimentary
Ironstone Nodules (Iron Concretion)
Siderite or Hematite Concretion
sedimentary
Ironstone Nodule
Ironstone (Ferruginous Rock)
sedimentary
Indeterminate metallic mineral fragments
Possibly pyrite, chalcopyrite, or metallic sulfide-bearing rock
mineral
Ironstone (likely Limonite or Goethite nodule)
Hydrothermally altered Ferric Hydroxide (FeO(OH)·nH2O)
sedimentary
Sandstone Concretion
Sandstone (Sedimentary rock, mostly SiO2)
sedimentary
Ironstone Concretion
Siderite or Limonite Concretion
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Vesicular Basalt with Oxidized Crust
Vesicular Basalt (Iron-rich extrusive volcanic rock)
igneous
Slag
industrial by-product
Ironstone Concretion (Limonite/Goethite)
Goethite/Limonite concretion (FeO(OH)·nH2O)
sedimentary
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Sandstone Concretion
Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)
sedimentary