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The main make up of comets is dust and rock after all not dissimilar to what we have here considering this is all discharge from debris flung up that being stone, dust, and dirt from the mountain.I looked at the paper and the value you used is the average value of all the dusts collected (From comets btw) bulk value
If ya wanted to go by this instead using the sandstone and granite mix would be best as they are sedimentary and are common in mountainous terrain. So 290kg/m3 instead of 490 if that makes ya feel like its more accurate also once again as afar as the in the air part goes that's the entire point of the hollowness my guy it takes into account its not some 100% solid structure the low end specifically is negged by the ten thousandthAka sitting in a pile, not floating through the air. So I don't know if it would be accurate to use in this situation since the dust of the mountain is being kicked up into the air likely lowering it's density per meter cubed.