Phil
Check this thread:-
http://www.iceinspace.com.au/forum/s...ight=ebonystar
Tannehill (Scott) gives the details for Ringwood Kitchens where we got our pieces. I think they are charging $25 for an offcut. Very helpful. They are used to dob owners asking about it.
I have a bit left, but not 50cm square. It's enough to make a few more Alt bearings.
ps. as I recall there are two different textures of Ebony Star. If you do a bit of searching for "Ebonystar" in this forum, you'll find the information you need.
Eric