Symmetric Canonical Self-Dual Decahedra

28 total:  4 

3 have C3v symmetry:  2 

4 have 5 edge lengths:  1 

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Self-Dual Decahedron #4 (canonical)
Vertices:  10  (1[3] + 3[3] + 3[3] + 3[5])
Faces:10  (1 equilateral triangle + {3 * 2} isosceles triangles
    + 3 mirror-symmetric pentagons)
Edges:18  (5 different lengths)
Symmetry:  3-fold Pyramidal  (C3v)
(values below based on edge-scribed radius = 1)
Edge 1 (3):  2*(2*sqrt(30)−3*sqrt(6))/11    ≈0.65563307668250690446
Edge 2 (3):  (13*sqrt(30)−25*sqrt(6))/11    ≈0.90606262782655839041
Edge 3 (3):  2*(4*sqrt(30)−5*sqrt(6))/15    ≈1.2881938115054338730
Edge 4 (6):  2*(3*sqrt(30)−5*sqrt(6))/5    ≈1.6736912044956371651
Edge 5 (3):  2*sqrt(30)/5    ≈2.1908902300206644538
Edge-scribed Radius:  1
Volume:4*(16711−4933*sqrt(5))/6655    ≈3.4142609568706460872