Water stains on hearth

Water stains on hearth Images

Water stains on hearth

Water stains on hearth Description

We have  what I believe to be black Granite (http://tanbrown.org) or slate on the floor in front of our fireplace.  A glass was set on it and (http://maplered.com) the condensation left an unsightly white ring.  Any suggestions, besides "don't leave glasses on the hearth!" 
 
Thanks in advance,
John Mark

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