Final answer:
Streak is the least useful property in identifying minerals due to its reliance on the color of a mineral's powder, which differs from the mineral's actual color.
Explanation:
Streak is generally the least useful property in identifying minerals. Streak refers to the color of the mineral's powder when it's rubbed across an unglazed porcelain plate. Unlike color, streak is a more reliable indicator of a mineral's identity, especially when dealing with minerals in small grains or rocks.
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