An average asteroidal moon, RK-9 is medium-sized and is silicate.
RK-9 does not have enough mass to have a spherical shape. It has a mass of 0.04 times earth, so does not have sufficient size to danger ratio to be colonized. It also is covered in several meteor craters.
A silicate moon, RK-9 is a dust-covered rocky asteroid. It has very little minerals left in it, as it was completely mined out because of stores of iridium and silver. What is left is a bit of iron and traces of titanium.