Streak: A mineral's streak is another way that you can determine a mineral's
identity. To perform the Streak Test you must have your unknown mineral and a
piece of unglazed porcelain. You then rub the mineral against the tile to
find its powder color. This test proves to be a more accurate way of
identifying minerals due to the fact that a mineral's streak never changes.
Pyrite's streak is greenish black.
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