I may not be parting with the "granite mojaves", but I do have a 2 "granites" from a different clutch for sale.
I gave a 2008 female with the same granite bloodline to my brother. He bred her to a yellowbelly this year( first time for her) and got a mix of yellowbellies and "granite" yellowbellies They look funky.
I'm thinking they are genetic, but I don't know if they are dominate or co-dominate. Other granite mojaves look totally different from mine. That's why I'm not sure if it's granite or something else.