They will separate very easily with a little shaking and you may not even have to do that. Keeping them mixed together would be the hard thing to do unless they are in a weightless frame of reference.
Glass.
styrofoam
no
Good insulators include glass, styrofoam, plastic, wood, rubber, cloth, air, glass, and etc. It really depends on what you want to use it for. For example, fiberglass or styrofoam works the best as heat insulators. And rubber or glass as electric insulators.
Windows, bottles, a glass for your wine, beer or orange juice, mirrors, ornaments, marbles, test tubes, and light bulbs are examples of things normally made from glass.
One possible way to separate wooden marbles from glass marbles is by using a magnetic field. Since wooden marbles are typically not magnetic, while glass marbles are also not magnetic, one can use a strong magnet to attract and separate the wooden marbles from the glass marbles. The magnet will attract the wooden marbles while the glass marbles will remain unaffected and can be easily sorted out.
You have to pick them up
Use static electricity or gravity. Get a statically charged object (static is always around when you don't want it) to draw the Styrofoam away from the glass. Or put them in a container and shake until the glass settles to the bottom and the Styrofoam winds up on top.
Glass.
A magnet will attract the iron beads but not the glas beads
Marbles are usually made of glass( The kind you play with).
glass contains styrofoam
styrofoam
That will depend on the size of the styrofoam pieces. If they are significantly larger than the sand, you merely pick them out by hand. If not, then a sieve can be used assuming the sand will go thru the sieve and the styrofoam will be too large to pass through. You need to find a sieve with the right size holes. Another way is to add acetone and the styrofoam will dissolve, and the sand will stay behind, but this technique doesn't give you the styrofoam back again.
because ages ago they used to use marbles instead of glass balls.
no
They were made of glass and poorer Victorians had clay marbles.