Reefer Rock is typically slightly more dense then typical Fiji Rock (some pieces more some pieces less) - Fiji is full of macro/micro pores while Reefer Rock is full of holes and crevices from 1mm to 1inch in size. I would say on average that a 3lb piece of Fiji would equate to a 3.5lb piece of equal sized Reefer Rock.
Just as a quick sample see the following.
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