Pentagonal dipyramid
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In geometry, the pentagonal dipyramid is one of the Johnson solids (J13). As the name suggests, it can be constructed by joining two pentagonal pyramids (J2) along their bases. It is a convex deltahedron. Although it is face-uniform, it is not a Platonic solid because some vertexes have four faces meeting and others have five faces.
The 92 Johnson solids were named and described by Norman Johnson in 1966.
External link
- Johnson Solid -- from MathWorld (http://mathworld.wolfram.com/JohnsonSolid.html)