I have just received this message from Evelyn proving that this blue mineral is definitely Sodalite and is produced locally:

QUOTE

I have just found further information which is proof that our blue beads can only be Sodalite - please read:

"Trial quarries have been opened close to the Nouadhibou-Choum-Zouerat railway on a number of the basement lithologies including sodalite-bearing syenite, anorthosite, garnetiferous quarzofeldspathic gneisses and pyroxene-bearing gneisses."

from: Mining Journal special publication, London,
February 2006 [page 3]

UNQUOTE

Evelyn added the link you will find below.

Sincerly yours,

Gabriel