While I don’t know about the Russian material, it sounds like what
you’re looking for might be the same mineral as what’s found in
Oregon sunstone. Not sure about the color, but the Oregon sunstone
is a feldspar and can come in a color similar to what you’ve
If you think this might work for what you need, Dust Devil Mine
(www.dustdevilmining.com) is probably the best place to go. I don’t
have any relation to them - I just wish I did.
Hope that might help!