streak

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streak

1. 
a. (of lightning) a sudden flash
b. (as modifier): streak lightning
2. Mineralogy the powdery mark made by a mineral when rubbed on a hard or rough surface: its colour is an important distinguishing characteristic

streak

[strēk]
(mineralogy)
The color of a powdered mineral, obtained by rubbing the mineral on a streak plate.
References in periodicals archive ?
A series of contiguous open circles was used to estimate the percentage of leaf width that showed chlorotic streaking.
It is easily available and shows prominent streaking symptoms.
During the evaluation of materials to be used in an appliance cover, the molder observed streaking in parts molded of a beige ignition-resistant (IR) polycarbonate.
Another streaking JetHawks is second baseman Chris Dean.