Bluestone is used to describe several mineral forms commonly called rocks. Some are sandstone infused with various 'impurities' which give the rock a blue or blue-green color. Some are limestone also with various sometimes different 'impurities' to provode the color. If you are talking about a limestone based bluestone, the density is about 2.5 which means it weighs 2.5 times what water weighs. One cubic foot of water weighs 62.4 pounds. So...
62.4 x 2.5 = 156 pounds
This is an approximation.
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