Making the sphere reflective and refractive is useless unless there
are other objects in the scene which the sphere can reflect/refract.
  In order to create a good-looking glass object you need an environment.
A glass object in empty space is practically invisible.

  "Practically" above means that a well-made glass object isn't invisible
even in empty space (as long as there's a light source illuminating it).
That's because a well-made glass object should have a specular or phong
highlight.

-- 
#macro M(A,N,D,L)plane{-z,-9pigment{mandel L*9translate N color_map{[0rgb x]
[1rgb 9]}scale<D,D*3D>*1e3}rotate y*A*8}#end M(-3<1.206434.28623>70,7)M(
-1<.7438.1795>1,20)M(1<.77595.13699>30,20)M(3<.75923.07145>80,99)// - Warp -

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