Phenakite

Phenakite is one of the brightest of the colorless gemstones. The hardness is 7.5 – 8, and has an excellent polish when faceted. It is also one of the clearest of the colorless gems, phenakite may be the whitest stone.

It is a rare beryllium mineral which unfortunately is not often used as a gemstone. Its name derives from the Greek word 'phenakos' meaning deceiver .. a name acquired because of its close similarity to quartz, especially rock crystal. Phenakite was initially thought to be a variety of quartz, but its crystal twinning is distinct. It has also been confused with diamond, sapphire, topaz and beryl.

en.wikipedia.org/wiki/Phenakite

For believers of the power of crystals Phenakite is also said to be a carrier of extremely high vibrations, most likely higher than any other known crystal. It is a powerful tool for activating the upper energy centers , the chakras.