What are twilight vampire made of?

Answer 1

Vampires are made of granite as Stephenie somewhat inderectly says in her book.

But how they are made (if that's what you're asking) is this:

A vampire bites a human and their venom spreads through the bloodstream creating a fiery and excruciating pain. It takes three days for the venom to do it's job and the newborn (a vampire that has just been created) is now through the pain and ready to hunt. The newborn's human blood remains in their tissues and makes the newborn's eyes a deep crimson red. Newborns are always stronger, and faster than vampires that have existed a long amount of time. Vampires are not living. They are immortal, and are very hard to kill.