Olivine (Peridotite)
Magnesium iron silicate ((Mg, Fe)2SiO4)
igneous
Category
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Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Weathered ironstone concretion (possible hematite/goethite concretion)
Hematite–goethite-rich ferruginous concretion; primarily Fe₂O₃ and FeO(OH) in a silica/clay matrix
sedimentary
Dark, vesicular volcanic rock (probable basaltic scoria)
Basaltic scoria; mainly plagioclase, clinopyroxene, olivine, and volcanic glass
igneous
Peridot ring
Gem-quality olivine, typically forsterite–fayalite solid solution ((Mg,Fe)₂SiO₄)
gemstone
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Peridot (Olivine)
Olivine ((Mg, Fe)2SiO4)
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
gemstone
Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Olivine (Peridot)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Mineral
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Basalt
Fine-grained mafic volcanic rock, chiefly plagioclase feldspar and pyroxene, commonly with olivine
igneous
Olivine (peridot) grain
Olivine-group silicate, typically forsterite–fayalite solid solution: (Mg,Fe)₂SiO₄
mineral
Moldavite
Tektite (Impact Glass), ~80% SiO2 + Al2O3
tektite
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
gemstone
Peridot
Olivine (Mg, Fe)2SiO4
gemstone
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
Mineral
Dark mafic rock, likely altered basalt or gabbro
Fine- to medium-grained mafic silicate rock; probable basaltic composition with plagioclase and pyroxene, possibly chloritized/serpentinized
igneous
Weathered quartz-bearing rock fragment
Indeterminate; likely quartz-rich granite or silicified host rock with iron-oxide staining
mineral
Unidentified dark mineral or rock specimen
Indeterminate from the severely blurred image; possible dark igneous rock or opaque mineral
mineral
Unidentified small rock fragments
Indeterminate from image; possibly quartz-rich material
mineral
Unidentified dark pebble
Undetermined; possibly polished basalt, chert, or iron-rich stone
mineral
Iron Slag
Anthropogenic Ferro-silicate
mineral
Tumbled basalt (probable)
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase and pyroxene, commonly with olivine and iron oxides
igneous
Fossiliferous Concretion
Septarian Concretion containing Brachiopods/Crinoids
fossil
Iron Concretion
Ferruginous concretion (Fe2O3·nH2O / FeO(OH))
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Iron Nodule
Iron-manganese concretion (Fe-Mn hydroxide)
sedimentary
Ironstone Concretion
Siderite or Goethite Concretion
sedimentary
Iron Slag
Anthropogenic pyrometallurgical residue
industrial byproduct
Olivine
Magnesium Iron Silicate ((Mg, Fe)₂SiO₄)
mineral
Claystone Concretion
Septarian Concretion (Ironstone-rich)
sedimentary
Limonite Concretion
Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)
sedimentary
Olivine (Peridot)
Magnesium Iron Silicate ((Mg, Fe)2SiO4)
mineral
Amethyst and Peridot
Amethyst (SiO2 with iron impurities) and Peridot ((Mg, Fe)2SiO4)
mineral
Ironstone Concretion (Limonite/Goethite)
Ferruginous Siltstone / Limonite Concretion (FeOO(OH)·nH2O)
sedimentary
Limitation Concretion
Ironstone Concretion (Goethite/Limonite)
sedimentary
Sandstone Concretion
Septarian Concretion (Nodule)
sedimentary