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I installed some American Granite stone sold by http://www.champlainstone.com/

The american granite has a mix of colors including a goldish color. Now after 1 year iron is bleeding out of the gold peices and going all over the place/staining the limestone treads. Is there anything to do to stop this? Stone was installed over concrete. Typical wetlaid installation.
 

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Not seeing the stone close up, I can only hazard a guess.

The gold colored material is pyrite--an iron sulfide.
It has a tendency to oxidize into an iron oxide --limonite-- when exposed to air and water. Limonite is for all intents and purposes---RUST.

Don't know if there is anything you can do to prevent this from happening --
maybe seal the crap out of the stone.

Common problem in some limestone I'm familiar with--so much so, they abandoned the quarry.

JVC
 
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