Roger,
That doesnt look like spalling but I bet fred has a better explanation.
I think that being in an exterior location the material has just degraded or worn due to the elements of its enviroment.

On Mon, May 9, 2011 at 11:21 PM, Roger Konarski <qm144@yahoo.com> wrote:
I have a question about the attached picture. What would be causing the banister to spall?
 
Thanks,
RK

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