In geometry, the gyroelongated square dipyramid is one of the Johnson solids (J₁₉). It is a three-dimensional solid that has equilateral triangles only as faces. It is a deltahedron. It is not a Platonic solid because some vertices have 4 faces meeting and others have 5.

The 92 Johnson solids were named and described by Norman Johnson in 1966.

External links

• Johnson Solid -- from MathWorld (http://mathworld.wolfram.com/JohnsonSolid.html)
• Gyroelongated Square Dipyramid -- from MathWorld (http://mathworld.wolfram.com/GyroelongatedSquareDipyramid.html)