Framboidal Pyrite-An Extraordinary Self-Organization of a Natural Mineral

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  • 鉱物結晶学の多様化：新たな広がりと挑戦　　２．地球表層鉱物（地圏物質）フランボイダルパイライト―天然における鉱物の不思議な自己組織化作用―
  • フランボイダルパイライト--天然における鉱物の不思議な自己組織化作用
  • フランボイダルパイライト テンネン ニ オケル コウブツ ノ フシギ ナ ジコ ソシキカ サヨウ
  • — An Extraordinary Self-Organization of a Natural Mineral
  • －天然における鉱物の不思議な自己組織化作用－

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Abstract

The 3D packing structures of the microcrystals in framboidal pyrite have been studied through morphological examinations and crystallographic orientation analysis to understand the self-organization process. The structures are divided into (i) face-centered cubic, (ii) icosahedral and (iii) random packings. The detailed crystallography of pyrite framboids is characterized by high-angle (∼90°) misorientations shown by about a half of the microcrystals in a framboid. This means that the crystallographic orientation of microcrystals is not uniform even in highly ordered framboids, suggesting that their self-organization process is not crystallographically controlled, but occurs by the physical rotation of individual microcrystals.

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