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Colombian Emeralds

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Streak

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The streak of a mineral is the trace amount of powder left behind if the mineral is rubbed along an unweathered surface, such as unglazed porcelain. Such professional versions are known as streak plates.

Emeralds, despite their color, leave behind a white powder, not green, and can act as a "quick-and-dirty" method of mineral identification, though such a method is hardly conclusive.

Beryl, in it's natural form, is colorless. The difference between the color of the streak and the green color of the emerald results from the only very small quantities of Chromium and vanadium are present in green beryl, and there would be an insufficient quantity present in the resulting powder to have a visible effect.

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