A streak is a long stripe or mark on a surface which contrasts with the surface because it is a different colour. There are these dark streaks on the surface of the moon The flames begin as a few streaks of red against the pale brown of the walls
a distinctive characteristic; "he has a stubborn streak"; "a streak of wildness" a sudden flash (as of lightning) an unbroken series of events; "had a streak of bad luck"; "Nicklaus had a run of birdies" run naked in a public place move quickly in a straight line; "The plane streaked across the sky
A winning streak or a lucky streak is a continuous series of successes, for example in gambling or sport. A losing streak or an unlucky streak is a series of failures or losses. The casinos had better watch out since I'm obviously on a lucky streak!. Colour of a mineral in its powdered form, usually obtained by rubbing the mineral on a hard, white surface (e.g., a tile of unglazed porcelain) to yield a streak of fine powder. The streak's colour is usually constant for a given mineral, even if the mineral varies in colour as it occurs in the field or if the streak is different from the colour of the unpowdered mineral. Streak is diagnostically useful because it may distinguish between mineral species that are otherwise similar in appearance
The color of the powder of a mineral If the minerals hardness [glossary] is less than 7, the powder can be obtained by rubbing a piece of the mineral across an unglazed, unpolished porcelain surface (Plumbers often can supply unglazed porcelain tiles ) If the mineral has a hardness of 7 or greater, then it probably will be necessary to scratch a small part of the specimens surface with a sharp instrument that has an equal or greater hardness
The streak of a mineral is its color when it is in powdered form You can determine the streak of a mineral easily by rubbing a rough mineral (not cut stones!) along the surface of a hard, unglazed porcelain sheet (this is called a streak plate - you can use the back of a white porcelain bathroom tile) Even though the color of a mineral may vary, the streak color is constant Note: the streak plate has a hardness is about 6 6, so it can only test mineral that are harder than that (since they must leave a streak on the porcelain) For example, the streak of chalcopyrite, graphite, magnetite, and pyrite is black, the streak of galena is gray, the streak of cinnabar, the streak of azurite and lapis is blue, the streak of malachite is green, the streak of turquoise is white with a green tint, the streak of olivine, amethyst, and tourmaline is white, and the streak of hematite is red-brown
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