When there are no impurities, pure quartz is water-clear and often referred to as “rock crystal”. Impurities can give transparent quartz beautiful hues, such as yellowish citrine (iron ...

There, he and his family have unearthed their own Kingdom of Saguenay at Cristal du Lac. Experiencing Canada host Nathan ...

SINCE quartz is transparent in the ultra-violet ... naturally suggests itself for this crystal. Rasetti's own studies 1 included quartz, but his exposures were very short (20 min.) ...