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.
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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.
Marble, being composed almost entirely of the mineral calcite, would have a white streak. The same colour as calcite's streak.
the probability is you'd get a green marble any other color is impossible. So, the probability is certain
A marble light is a light fixture made of marble.
That depends a lot what you want to measure: its diameter, surface area, volume, mass, density, color, hardness, etc.