Not even very compressed. Just enough to it, be monolith, as usual asteroids are just like stuck together small stones of irregular form, plus cosmic dust, also

Not even very compressed. Just enough to it, be monolith, as usual asteroids are just like stuck together small stones of irregular form, plus cosmic dust, also not dense. Question is, that at the moment not found any similar asteroids, so this is not common for them, to appear such way. So, when we see something so unusual, we have two options - they could be just from more heavy elements, or their history was unusual.