A bund consists of: an impervious bund wall or embankment surrounding the facility or tanks. an impervious floor within the bunded area. any joints in the floor or the wall, or between the floor and the wall.
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Almost everything I have seen is dyed magnesite and sometimes howlite. There is a turquoise from China that is yellow/brown, it gets its color from the iron in the stone or another mineral depending on the color. To sum this up, turquoise is emotional and every individual will have their personal tastes.