Marble, being composed almost entirely of the mineral calcite, would have a white streak. The same colour as calcite's streak.
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Marble comes in every color imaginable. It can be a chalk-white to a onyx-black. It can be calico colored as well from every color including different colored cyrstals to add to the mix. Marble for exterior use is normally white.
a streak test is a test wheree you rub a mineral across a streak plate to see the color of its streak, which is a better indentifying factor of the mineral than the external color. A scratch test is when you scratch a mineral to find out its hardness on the Mohs Scale of Hardness. This is also another useful identifying factor
the 5 properties are cleavage hardness luster color streak
Marble is a metamorphic rock and the hardness of the marble is determined by the indigenous rock of the area rather than color. There are some white marbles, such as Vermont White (from Brazil) that had a hardness close to that of granite.
the probability is you'd get a green marble any other color is impossible. So, the probability is certain