English: Basalticscoria (about 8 cm large) coming from Amsterdam island ; blue iridescent color could be caused by interferences phenomenon in a thin and smooth layer of hematit (Fe2O3)
Français : Scoriebasaltique (environ 8 cm de large) provenant de l'île Amsterdam ; la couleur bleue irisée est probablement due à des phénomènes d'interférences d'une fine couche vernissante d'hématite (Fe2O3)
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{{Information |Description= {{en}}Basalticscoria (about 8 cm large) coming from Amsterdam island ; blue iridescent color could be caused by interferences phenomenon in a thin and smooth layer of [[:C
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