Marble, CaCO3 will not usually scratch glass, but maybe a very soft glass.
Marble has a hardness of 3 to 4, whereas glass is 4.5 to 6. (in a relative hardness scale.)
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A glass child's marble is made by dropping a small slug of semi liquid glass into the space between the pair of rounded grooves, that spiral away along a pair of rollers. Emerging as a round marble, and now cooler.
Marbles originated in ancient Rome and Egypt and were made from marble (rock). However this was expensive so people tried to find alternatives and in 1846 a German glass blower invemnted a marble made from glass.
little round things usually made of glass about 7/16 inch in diameter used in games
Not if it is a glass marble, but you can get metal marbles which would be magnetic in many cases.
A marble light is a light fixture made of marble.