Asteroids from different populations could have different classes (stoney, carbonaceous, icy, etc.). At the most basic level, this could just be a different model. At more advanced levels, it could affect science options, or have an impact on mining mods such as Kethane, Extraplanetary Launchpads, or Interstellar.

Asteroid classes implemented with science flavor text and different resources. Procedural models/textures will need to come later (reopened as #25).