In geometry, the great dodecacronic hexecontahedron (or great lanceal ditriacontahedron) is a nonconvex isohedral polyhedron.
It is the dual of the uniform great dodecicosidodecahedron.
Its 60 intersecting quadrilateral faces are kites.
Part of each kite lies inside the solid, hence is invisible in solid models.
Each kite has two angles of
arccos (
arccos ( −
arccos ( −
The dihedral angle equals
arccos (
The ratio between the lengths of the long and short edges is
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