Nora, I believe these are old European beads, likely made in the Bavaria area, see the Fichtelgebirge bead and button industry of Bavaria from Karlis Karklins, Jargstorf and Dussubieux in BEADS volume 28
Here are a strand of mostly Rock/ cx excavated lately in the Djenne area.
Also a quick shot in a show case in the Museum relative to rock/cx.
JP