Congratulations on your finds, Lulu, I didn't get my first African trade bead until I was about 14! We need to encourage new interest in our area of collectibles in order to "keep the love alive"! Keep up the hunt, always paw to the very bottom of the goody boxes at the sales, and always get down to check out the bottom shelf of any display case! Over time, you won't be sorry!

a confused mixture.
"Rob's living room was a hodgepodge of modern furniture and antiques"
synonyms: mixture, mix, mixed bag, assortment, random collection, conglomeration, jumble, ragbag, grab bag, miscellany, medley, salmagundi, potpourri, patchwork, pastiche; More
mélange, mishmash, hash, confusion, farrago, gallimaufry
"a rambling hodgepodge of Chinese modern and art deco"

Origin
late Middle English: alteration of hotchpotch by association with Hodge (a nickname for the given name Roger ), an archaic British term used as a name for a typical agricultural worker.
Translate hodgepodge to
Use over time for: hodgepodge

The dark gray beads with the silver clasp could be hematite (are they very heavy and cold?), or they could be plastic pearls, or they could be glass pearls...or maybe they're "real" pearls dyed black.
They are strung in the manner of pearls, with french wire protecting the cord near the clasp (which is a nice locking clasp), and knots between beads.
If you rub a "real" pearl (one grown in an oyster) against one of your front teeth, it will feel gritty; glass or plastic or stone will feel smooth.

Your green bangles might be bakelite (or some other plastic) or they could be dyed stone. Stone would feel heavy and cold - it you touch stone against your neck, it will make you shiver.

The Green bangles are very heavy one is 65g and one is 61g
they are cold , they are a bit small my mum can't fit her hand through them.You can't even make a cut with a sharp knife and if you try to poke a hot pin in them you can't . They sound like glass when they knoc together they sound like music a bit like wind chimes I think there is one or 2 bubbles in one of them I think .
y beads they are black ones I think the white cover was a bad place to take a photo they are not grey . They are not freezing cold but they are cold and heavy the weight is 65g my brother max said if you have some beads that cost you a lot of money you could tie a not in the string so you don't lose all the beads if they broke, but I think they might have a mum who says they will ALL be sucked up with the hoov er if they left are on the floor and I bet thats why people tie a not in the string because they have a mum like mine . My yellow beads smell nice but a bit funny if you put a lighted match near them , but my green beads are plastic and they catch fire then your mum really goes mad I'm not allowed to do that

And you are correct, knots are tied between valuable beads such a pearls to keep them from scattering all over the floor if the string breaks.

The knots also protect the beads from grinding against each other - pearls can be damaged if they're strung tightly together without knots.