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We have a large water fountain in our hotel lobby made of coral stone. the problem we have is that there is a copper basin that holds the water. The copper is causing the coral stone to turn green and we are finding large green and white, hard deposi

The hard, green deposits you describe is a combination of calcium deposits from the water and copper from the basin. The easiest way to remove them is to use a pressure washer. Be sure to test the pressure washer on an inconspicuous area, since too... Read More

I tried polishing a green marble tile, I think it was called Taiwan green. The marble was shiny but it did not have the depth that most marbles have. Is there a technique I can use to get the depth and clarity?

Many green marbles will not have the depth of shine that other marbles have. The greens from Asia are some of these types. The surface will have a good shine but little clarity.Unfortunately there is not much that can be done to give the stone any... Read More

What gives stone its color?

The color in all stone is derived from minerals and organic matter. For example red marbles are red due to the presences of iron. Green marble gets its color from a mineral called serpentine and so forth. There are several excellent books on rock and... Read More

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