I'm no good @ Vitro I.D. so a couple links, I believe the first 2 are the same just from different places, I posted both, one just might load quicker for ya ??
LINK :: https://www.allaboutmarbles.com/viewtopic.php?f=7&t=3490&p=278203&hilit=Vitro+ID+guide+by+Kevin+Roberts#p278203
LINK :: https://www.tapatalk.com/groups/mibzandmore/vitro-agate-id-guide-t35.html
SMORE FROM STEPHS STUDY HALL;
LINK :: https://marbleconnection.com/topic/6787-mostly-pix-vitro/#comment-60795
LINK :: https://marbleconnection.com/topic/7278-links-vitro-agate/#comment-64774