How can I normalize the mark color in scatter3 to my Z column of data?

I have a large set of x,y,z data which I am trying to produce a 3d scatter plot for. X and Y coordinates are positional information while the Z column corresponds to the size of a mark left on the floor.

I would like to produce a scatter plot in which the marks correspond to the area in color.

The Z distribution is heavily skewed toward smaller values, so I need some way of changing the colour map to allow me to use quartiles or some kind of binning method with which to change colors using the scatter3 command.