Johnson Solids (Page 1)
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(F: faces)
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(J14)
Elongated Triangular Dipyramid
regular faces
Vertices:
8 (2[3] + 6[4])
Faces:
9 (6 equilateral triangles + 3 squares)
Edges:
15
Symmetry:
3-fold Prismatic (D3h)
(values below based on edge length = 1)
Volume:
(2*sqrt(2)+3*sqrt(3))/12
≈0.668714962287735164849