Thanks LC. I wonder if this composite was made 100 plus years ago?lostcauses said:alumina ceramic is the material
This site shows a similar item
http://www.tootoo.com/d-rp24941622-Advanced_Ceramic_Parts/
You might email em and ask them what it is.
Also this site
http://www.p-wholesale.com/cn-pro/13/549to2/various-shapes-of-ceramic-parts-496160.html
ceramic valve part most likly