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 classic literature ?
Under the dais appeared a pale and noble countenance with black eyes, black hair streaked with threads of white, a delicate, compressed mouth, a prominent and angular chin.
There is heavy traffic hereabouts--the cloud-bank beneath us is streaked.
Already, at thirty-five, grey streaked the scanty, dull hair, wrinkles lined the worn olive-brown face, and the tendons of the thin neck stood out.
It is, as he said, beautifully situated, but it is not beautiful in itself, for it is a large square block of a house, whitewashed, but all stained and streaked with damp and bad weather.