Streak: Hematite and Malachite

Streak: Hematite and Malachite

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Credit: JOEL AREM/SCIENCE PHOTO LIBRARY

Caption: Streak is the color of a mineral powder. In many cases the apparent body color of a mineral is very different from its powder. Black hematite (left in photo) has a red streak. The green streak of malachite (right), however, is similar to its body color. A 'streak plate' is a hard porcelain tile that mineralogists typically use to create a powder when a mineral specimen is rubbed against it.

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Keywords: arem collection, geology, green streak, hematite, malachite, mineral, mineral powder, mineral properties, mineralogy, minerals, polished, porcelain tile, powder, properties, red streak, specimen, streak, streak plate, tests

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