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Line 6: A uniaxial mineral will show a straight cross shape with its isogyres, which will rotate in a solid form around the center of the figure. A biaxial mineral can show a crossed figure (with one isogyre thicker than the other, typically) that will often morph into to curved isogyres with rotation of the stage. The difference in these curved isogyres is known as the "[[2V]]" angle. In minerals that have far-off-center optic axes, only one part of the above sequence may be seen. ==References==

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