Crystal costume

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When crystal habit (short: costume ) is in the mineralogy the entirety of at a crystal developed crystal faces , i.e., the number and combination of types of areas of the outer boundary surfaces of the crystal indicated. It is in contrast to the crystal habit , which describes the size ratio to each other. Costume and habitus together result in the crystal shape, which is also referred to as crystal morphology (from ancient Greek μορφή morphé , German 'shape,' form ' ).

Examples of different crystal costumes with the same - here isometric - habit are:

  • extensive apatite crystal with {100}, {110}, {001}, {111}, {201}, {101} and {102}

  • Apatite crystal with {100}, {001}, {111} and {101}

  • Apatite crystal with {100}, {001} and {101}

  • low-area apatite crystal with {100} and {001}

Examples for a different crystal habit with identical crystal costume (the same colors represent the same surface shapes) are:

  • flat apatite crystal with tabular habitus

  • flat apatite crystal with isometric habit

  • flat apatite crystal with a long prismatic habit

  • extensive apatite crystal with a needle-like habit

literature

  • Rudolf Graubner: Lexicon of geology, minerals and rocks . Emil Vollmer Verlag, Munich 1980, ISBN 3-87876-327-1 , p. 203 (crystal figure).

Web links

Individual evidence

  1. ↑ Frank Hoffmann: Fascination Crystals and Symmetry. Introduction to crystallography . Springer Spectrum, Wiesbaden 2016, ISBN 978-3-658-09580-2 , p. 40 , doi : 10.1007 / 978-3-658-09581-9 .