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The specimen with different direction, with the field or a magnifying glass to see a group of parallel dark and straight line or a line or plane appears on the cleavage plane until it is twin.
将标本向不同方向旋转，直到用野外或放大镜看到晶面或解理面上出现一组平行的明暗相间的直线或折线，这就是双晶纹。
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