Jisho

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じょうこん 条痕
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Noun
1. linear mark; abrasion; scratch; streak​
Wikipedia definition
2. Streak (mineralogy)​The streak (also called "powder color") of a mineral is the color of the powder produced when it is dragged across an unweathered surface. Unlike the apparent color of a mineral, which for most minerals can vary considerably, the trail of finely ground powder generally has a more consistent characteristic color, and is thus an important diagnostic tool in mineral identification. If no streak seems to be made, the mineral's streak is said to be white or colorless.
Read “Streak (mineralogy)” on English Wikipedia
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Read “Streak (mineralogy)” on DBpedia

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