Although, Venusian Broon, you might be onto something with the idea of making the Aeroliths come mainly from meteors. The stuff forms far more prolifically in space, where aether currents are more free-flowing, so it would make sense that it's associated with space rocks.
Okay, so Aeroliths cannot be smelted unless the forge fire is fueled with a material called Arcana. This is a mineral that is found in large underground deposits; it is midnight blue, speckled with flecks of gold. The mineral's magical properties allow a forge fire to melt the Aerolith and prepare it for shaping.
The shaping process for Aerolith is called spinning. It's similar to glassblowing; the smith takes the semimolten Aerolith and uses a tool called a spinning-rod to pull the Aerolith into the desired shape. The object cannot be quenched in water or oil; it must be allowed to cool on its own. Much of the Aerolith's mass moves naturally to its surface and leaves the inside of it in a pattern not unlike bird bones, making it extremely durable, as well as light.