http://www.the-jmcc.org/scepter-quartz/
How is Smoky Quartz formed in Granite and how does it differ from Rock Crystal?
What is the largest size crystal sceptre recorded? Thanks in advance.
Smoky quartz is typically found in granite mountains that have small but persistent levels of radioactivity. Smoky quartz usually contains aluminum impurities that turn the quartz smoky gray when exposed to radioactivity. If enough aluminum is present, the quartz can turn completely black, and is called "morian". When treated with extremely high temperatures, the quartz will return to a clear form. Cavities in rock crystal are called "negative crystals"; those containing bubbles are known as two-phase inclusions, and interior 'cracks' appear as iridescence.
Crystal Quartz can even contain another quartz crystal that formed from a mix with a slightly different chemical makeup than the original quartz, and eventually engulfed it causing a crystal to be visible within the larger crystal; a phenomenon known as a "Phantom" crystal. Although smoky quartz crystals can also be found in larger sizes, at a certain point they become too dark and opaque to be useful, and Arkansas quartz turns into very dark brown smoky quartz when irradiated, and is mostly sold as specimens.
I hope this helps. Maybe the websites help.
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