Aggregate Weight Comparison

A friend is having new foot drains installed around his house. The contractor is using a dark stone (round rock) aggregate that's about 8 times larger than number 57 gravel which I think is limestone. Although limestone may weigh less than these small round rocks, I venture to guess that one cubic yard of 57 gravel weighs more than one cubic yard of those small rocks. My friend says "no" but can't give any logic to his answer.
I've seen these small rocks in the gravel pit when I've picked up loads of 57 so I think their pretty common and probably often used to fill on top of footer drains. Anyone have an opinion of which - most likely - weighs more? I'm positive if they were both made of two different sizes of the same limestone, a cubic foot of number 57's would weigh more than the larger size but I don't know how dense those darker stones are and if they are denser, whether or not they would be dense enough to outweigh the added compactness of the smaller stones.
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