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One common reaction is called serpentinization, because it converts olivine into another kind of mineral called serpentinite.

Rise says that's not a concern since there will be very little serpentinite in the waste rock.

The leaching tests, meant to simulate what might happen to a waste rock pile when it rains, found that arsenic leached at concentrations 17 times greater than the water quality standards from samples of the mineral type serpentinite.

“I honor the right of every nation in this room to pursue its own customs, beliefs, and traditions,” Trump said, from the lofty green serpentinite rostrum overlooking the General Assembly.

This process creates a marbleized rock that the ancient Romans called verde antico, or what geologists like Klein call serpentinite.