Couple questions about marbles?

couple questions about a marble i think sculpture i have of pele coming out of the lava, i live in hawaii the big island and my sculpture is outside where it rains a lot, should i put some mineral oil or something to protect it, it weighs about 300 lbs. and is semi transparent and cold, white with little color differentation throughout, can i keep it outside and i don't exactly know what type of stone it is,. todd.

What could be causing the marble to warp?

We have a building where 30mm Bianco Carrara panels were install mechanically on an arch about 20 years ago. There is a gap of about ½" between the concrete wall and the marble. The contractor caulked the perimeter of the marble arch some years after the installation. The wall faces west and is expose to the heat of the sun in the afternoon. We are considering replacing the arch to a cost of about $ 50,000 because of warping in the panels. What could be causing the marble to warp, and if we have them replaced, will we have the same problem again? Please let us know.

Thank You.

Josemaria.