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blue quartz
The blue variety of Quartz, which is very uncommon in nature and rarely in crystal form. Most "Blue Quartz" is what is popularly known as " Aqua Aura", essentially clear Rock Crystal synthetically irradiated with gold to form a deep sky blue color. Blue Quartz may also refer to a dull grayish-blue Quartz in massive form with Crocidolite inclusions.
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