macropinacoid definition

  • noun:
    • one of several two planes of an orthorhombic crystal which are parallel on vertical and longer horizontal (macrodiagonal) axes.
    • one of several two planes of an orthorhombic crystal that are parallel towards the straight and longer lateral (macrodiagonal) axes.
    • In crystallography, a plane parallel towards the vertical and macrodiagonal axes of an orthorhombic crystal. See pinacoid.
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