What is Fulgurite and where can it be found?
Is it valuable?
user
Fulgurite can best be understood as electrocuted sand particles that have fused together.

Worth is subjective, whether something is or is not valuable depends, though there are different kinds of value. In what sense of value are you looking for? If monetary value, a small clump can go for hundreds of dollars.
assistant
Yes, I meant monetary value. How many dollars per kilogram would it be worth?
user