Icosahedral domain structure of framboidal pyrite

Hiroaki Ohfuji, Junji Akai

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)


A new type of frambiodal pyrite, with icosahedral domains, is described in this study. Examining the microcrystals on sections of framboids from various localities using a scanning electron microscope, we found pentagonal and trigonal patterns. These are made up of rectangular and fan-shaped domains, and octahedral microcrystals are regularly linked by sharing of edges in each domain. These symmetrical arrangements are interpreted to be different sections of icosahedrally arranged framboids which are composed of twenty tetrahedral domains. Thus some pyrite framboids are not spherical, but are fundamentally icosahedral both in appearance and internal structure. The formation of the icosadhedral framboids might be related to the initial nucleation rate and the number of microcrystals within each framboid.

Original languageEnglish
Pages (from-to)176-180
Number of pages5
JournalAmerican Mineralogist
Issue number1
Publication statusPublished - 2002
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology


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