Dang ... I am proud of myself. I didn't know what the name of those Australian "marbles" could be ... but that letter Q stuck with me ... all those years later ... and sure enough. They were called Quandongs.
So, I say with mingled pride and humility, I really have been blessed with a fine memory.
http://marbleconnection.com/topic/7681-tome-whaddaya-know-about-quandongs/