Johnson Solids (Page 5)

(box: x-ray)  (F: faces)  (slider: perspective)  (image: L=rotate R=zoom)  (M: metrics)

(J85) Snub Square Antiprism
Vertices:  16  ({8 * 2}[5])
Faces:26  ({16 + 8} equilateral triangles + 2 squares)
Edges:40
Symmetry:  4-fold Antiprismatic  (D4v)
(values below based on edge length = 1)
Volume:sqrt(root[531441*(x^6)    
    −85726026*(x^4)−48347280*(x^3)    
    +11588832*(x^2)+4759488*x    
    −892448])    
≈3.60122200973393031249