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How to distinguish between gem and crystal
Jan 09, 2017

Although the amethyst birefringence and cordierite close (0.008 to 0.012), but the color and multiple color difference is more apparent. The color of the leather bluestone is a blue, purple, blue rarely amethyst purple. Leather engraved with obvious pleochroism, visible to the naked eye, observing from different directions, to see different colors. Amethyst is the same color tints of blue and purple changes in different shades of (purple). In addition, amethyst is an axis crystal, with a bull 's-eye interferogram, and cordierite for biaxial crystal.