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June 8, 2007, Newsletter Issue #143: Streak

1

Tip of the Week

The streak of a mineral is its color when it´s in powder form. We usually identify the streak of a particular specimen by rubbing it across a piece of unglazed porcelain (a ´streak plate´). Some minerals leave no streak, or leave a streak that is the same color as the mineral. However, many minerals do have a diagnostic color that is more reliable for identification purposes than the color of the specimen itself.



2

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