because Gold weathers out of felsic rocks, while platinum weathers out of mafic rocks
Rocks, soils, minerals, wood, and man made materials all deteriorate due to weathering when they come into touch with water, air gases, and living things. Weathering is distinct from erosion since it takes place in situ (on the spot, with little to no movement), as opposed to erosion, which includes the transportation of rocks and minerals by forces such water, ice, snow, wind, waves, and gravity. Physical weathering and chemical weathering are the two types of weathering processes. Physical weathering is the mechanical deterioration of rocks and soils caused by heat, water, ice, or other elements. Water, gases from the atmosphere, and chemicals created by living things all interact chemically with rocks and soils during chemical weathering. Physical and chemical weathering are mostly caused by water.
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