horn

Hello, I'm interested mainly in turning natural materials. I have experience with turning wood, but wanted to try antler, bone or horn. Several questions: What to look for when sourcing online? How to determine if a specific specimen is of acceptable workability (density, stability etc) for pen...

I've always been wanting to try new types of pen blanks but I wasn't sure how they would turn out. Has anyone used: deer/buffalo horn, corncobs, shredded money, coffee beans, computer chips? If so, what have you thought of the material?