This forum had been coming up for years in searches I've done re: different rocks.  I thought it was time to join as I really appreciate the level, informative conversations.  Full disclosure, I'm a rock hoarder.  I love rock sales and have brought truckloads home.  When I have time, I love to go rockhounding.  Retirement is in a couple years and my retirement is in my yard with lots of equipment to use and fix.