Could you please let me know if you have any metamict titanite (sphene) available or if you can direct me to a potential source? I am particularly interested in large grains for an experimental study on metamict titanite replacement. My previous request for metamict zircon on this mailing list was successful, thanks to the generosity of some members, so I am hopeful for a similar outcome this time. John Professor John C. Ayers Dept. of Earth & Environmental Sciences Vanderbilt University PMB 351805 2301 Vanderbilt Place Nashville, TN 37235-1805 Tel 1-615-973-1879 https://my.vanderbilt.edu/johncayers he/him/his