Why sand is attracted to magnet even though it is not a metal?

The grains, particularly black grains, are most likely to be micrometeorites from the space. By definition, a chunk of rock drifting in space is called meteoroid. The same chunk, when it plunges into Earth’s atmosphere and causes fiery trail, is called meteor or shooting star. When the chunk hits the ground it’s called meteorite.

Most bounder-sized meteors never reach Earth’s surface as they burn up due to friction with air. However, countless micrometeorites, no longer than a grain of sand, manage to reach the surface adding about 400 tons of matter to Earth each day. They are made largely of iron and nickel. Both of these elements are magnetic, so if you drag a magnet over the ground it will pick up some particles. Most particles will be dust from outer space.

Additional reading:
Magnet (Wikipedia)

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