An elongated pentagonal dipyramid is formed by attaching two pentagonal pyramids to the two pentagonal bases of a pentagonal
prism.
The convex equilateral form with regular polygonal faces
is the Johnson solid 
.
It has 12 polyhedron vertices, 25 polyhedron edges, and 15 faces. The faces
consist of 10 equilateral triangles and 5
squares (McCooey).
See also
Dipyramid,
Pentagonal
Prism,
Pentagonal Pyramid
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References
Johnson, N. W. "Convex Polyhedra with Regular Faces." Canad. J. Math. 18, 169-200, 1966. https://doi.org/10.4153/CJM-1966-021-8.McCooey,
D. I. "Elongated Pentagonal Dipyramid." https://dmccooey.com/polyhedra/ElongatedPentagonalDipyramidJ16.html.Referenced
on Wolfram|Alpha
Elongated Pentagonal Dipyramid
Cite this as:
Weisstein, Eric W. "Elongated Pentagonal Dipyramid."
From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/ElongatedPentagonalDipyramid.html
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