Ref: http://wiki.povray.org/content/Reference:Array
Imo the mixed option needs a little example,

#declare MyArray = array[10];
#declare MyArray[5] = pigment{White};     //all other elements must 
                                         //be pigments too.
#declare MyArray[2] = normal{bumps 0.2};  //generates an error
#declare Thing = MyArray[4];              //error: uninitialized array 
element

#declare MyMixedArray = array mixed[10];
#declare MyMixedArray[5] = pigment{White};
#declare MyMixedArray[2] = <1,2,3>;

#declare SphereMix = array mixed[3]{<1,2,3>, 3, pigment{z}};
sphere{
    	SphereMix[0], SphereMix[1] 
    	texture{Spheremix[2]}
}

ingo

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