I went to the farmers market yesterday and picked up a pint of cherry tomatoes and placed them next to the sink on our new quartzite countertop. Earlier this evening I moved the tomatoes and discovered a greenish blue stain, the same size as the container, underneath where it had been sitting!!

So far I have tried Miracle cleaner, baking soda & water poultice, Mr. Clean and Comet. I have searched the web but I can't find anything about these green produce baskets staining countertops! It was very humid here today, but I can't think of anything out of the ordinary that would cause this. Does anyone have any ideas on how to remove the stain?!