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Related Experiment Videos

Twinning in natural melilite simulating a fivefold superstructure.

Luca Bindi1, Leigh H Rees, Paola Bonazzi

  • 1Dipartimento di Scienze della Terra, Università di Firenze, Via La Pira 4, I-50121 Firenze, Italy. lbindi@steno.geo.unifi.it

Acta Crystallographica. Section B, Structural Science
|January 30, 2003
PubMed
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Melilite crystals exhibit a pseudo-tetragonal supercell due to coexisting twin domains. Analysis reveals specific conditions for overlapping reflections, clarifying the observed non-crystallographic pseudosymmetry in melilites.

Area of Science:

  • Crystallography
  • Materials Science
  • Mineralogy

Background:

  • Melilite minerals are known to exhibit complex diffraction patterns.
  • Observed additional reflections in melilites have been previously interpreted as indicative of a tetragonal fivefold supercell.

Purpose of the Study:

  • To investigate the origin of additional reflections in melilite structures.
  • To elucidate the nature of the observed non-crystallographic pseudosymmetry in melilites.

Main Methods:

  • Analysis of X-ray diffraction intensity data.
  • Examination of crystallographic twinning and domain coexistence.

Main Results:

  • The additional reflections are attributed to the coexistence of two twin domains related by a (120) twin plane.

Related Experiment Videos

  • Specific conditions for the overlap of reflections from the two domains were identified: h(b)^2 + k(b)^2 = 5n, -h(b) + 2k(b) = 5n, and 2h(b) + k(b) = 5n.
  • The relationship between the crystallographic indices of the superimposed reflections from the two domains was determined.

    • Conclusions:

    • The apparent tetragonal fivefold supercell in melilites arises from a twinning phenomenon, not a true supercell.
    • The study clarifies the structural basis for the observed pseudosymmetry in the melilite group minerals.