We have discovered the next Tolkien... for the detail and not because he's a fairy.
Moke, not to rain on your reign… a very comprehensive list of available blank types… hell, most of those blank types I’ve never heard of let alone try to pronounce, however, these could be a couple that may be camouflaged
in your technical synopsis and some prospective turners may explicitly seek them out by their more basic characteristics.
Antler:
a pain to get a long straight piece for some tubes. Don’t be afraid to reveal live edges,
All my antler based pens with live edges were first to be snapped up.
Buffalo horn:
Some are totally black, while others have some streaking… dogs love the shavings like with the antler.
Snakeskin:
Have tarnished (yellowed) being locked up for 17 years. Recommend buying the blanks… not catching and making your own.
Alternate Ivory:
though may be resin based, they seem to be in a class of their own. Subtly different from white blanks.
Aluminium:
Pre cut for both Sierra and Cigar. I've been told they can be processed on a wood lathe using good chisels, however, I haven’t turned a pen from it yet. Would look great with a chrome pen kit.
M3 Mokume Metal (Metal Composite Blanks):
Were some of my best/most expensive sellers (to executives).
If your first cut is too short... Take the second cut from the longer end... LBD