Crystal Lined Amethyst Polished SliceNatural Agate and Amethyst Slice. Purple Amethyst crystals transition to clear natural crystals lining the interior of this slice. Specs of iron inclusions within the crystal. Amethyst is a translucent purple variety of quartz and is the birthstone of February. This polished slice has been hand selected. Beautiful for a display or putting in your window and letting the light sparkle through. Amethyst is said to be a stone of protection and is used as