Peridot
Olivine ((Mg,Fe)2SiO4)
gemstone
Category
Meteorite
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Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Moldavite
Tektite (Amorphous Silica, SiO2 + Al2O3)
mineral
Slag (Industrial)
N/A (Anthropogenic Slag)
industrial by-product
Polymict breccia (likely impact breccia)
Polymict lithic breccia; composition appears basaltic/mafic clasts in a dark, fine-grained matrix
igneous
Likely polished basalt or iron-rich metamorphic rock
Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing
igneous
Gold Nugget
Gold (Au)
mineral
Iron-rich hematite/goethite concretion (likely limonite)
Hematite (Fe₂O₃) with goethite (FeO(OH)) and limonite
mineral
Gold
Gold (Native Element); Au
mineral
Lunar Meteorite (Feldspathic Breccia)
Lunar Feldspathic Breccia
igneous
Limonite / Goethite Ironstone Concretion
FeO(OH)·nH2O (Hydrated Iron Oxide)
mineral
Goethite Concretion
Goethite (FeO(OH))
sedimentary
Ironstone Concretion
Ironstone (Limonite/Goethite/Hematite mixture)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron-rich sedimentary rock (FeOx)
sedimentary
Sandstone Concretion
Sedimentary concretion
Sedimentary
Olivine in Basalt matrix
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
igneous
Ferruginous Sandstone (Ironstone Conglomerate fragments)
Ferruginous clastic sedimentary rock (SiO2 cemented by Fe2O3)
sedimentary
Olivine (Peridot)
Olivine (Mg, Fe)2SiO4
mineral
Concretion in Shale
Siltstone/Shale with Siderite or Calcareous concretions
sedimentary
Olivine (Peridotite)
Magnesium Iron Silicate - (Mg, Fe)2SiO4
igneous
Olivine (in Peridotite/Dunite form)
Magnesium Iron Silicate (Mg,Fe)2SiO4
igneous
Olivine/Peridot
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Black-and-white bicolored pebble
Likely basalt with a pale felsic or carbonate coating/inclusion; exact identification requires testing
igneous
Martian Meteorite (Black Beauty)
NWA 7034 (Northwest Africa 7034)
igneous
Tektite (Indochinite)
Tektite (SiO2 + Al2O3)
mineraloid
Tektite (Indochinite)
Natural glass (High-silica impact glass)
mineral
Tektite (Indochinite)
Impactite / Tektite (Silica-rich glass)
igneous
Tektite
Tektite (Natural Glassy Ejecta)
mineral
Moldavite
Moldavite (Siliceous vitreous substance)
tektite (natural glass)
Black Dolomite
Bituminous Dolomite (CaMg(CO3)2)
sedimentary
Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone
Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides
sedimentary
Ferrochrome Slag
Anthropogenic slag (Fe-Cr alloy waste)
industrial byproduct
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Peridot
Olivine (Mg, Fe)₂SiO₄
mineral
Likely weathered iron-rich pebble (brown sandstone or ironstone)
Indeterminate ferruginous sandstone/ironstone; commonly quartz (SiO₂) with iron oxides such as goethite and hematite
sedimentary
Weathered quartz-rich rock fragment
Likely quartz-bearing sandstone or granitic rock; exact identification is uncertain from the image
mineral
Unidentifiable embedded dark fragment
Indeterminate; possibly a dark silicate mineral or lithic inclusion
mineral