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Sometimes the color is concentrated in zones parallel to crystal faces, giving them a phantom-like appearance.
This is due to changes in environmental conditions during growth, namely fluctuations of the iron content and temperature of the solutions the crystals grew in.
This single point idar oberstein actually true for all quartz varieties whose color is irradiation-induced smoky quartz, citrine, pink quartz.
In the summer I often cover my showcases with a black cloth.
Amethyst shows a weak dichroismwith the color changing from gray-violet to purple.
Amethyst owes its color to high energy radiation, single point idar oberstein. For a review of the different recent theories, see Rossman,early theories have been discussed by Holden, Do not expose an amethyst to direct sunlight for a long time.
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