Blue Hackmanite 10mm Round - 15-16 Inch Gray The stone's composition remains somewhat

The stone's composition remains somewhat ambiguous

Its name derives from the Sinhalese word “turamali

Red Agate is a form of Chalcedony

They are all silicate minerals

Ancient Cellar Black Agate is a natural agate that is dyed and heated to give it the unique color and pattern we call Ancient Cellar

Blue Hackmanite 10mm Round - 15-16 Inch Gray The stone's composition remains somewhatDiscovered in Greenland in the late 1890's, hackmanite is named for Finnish geologist Victor Hackman. It is a rare occurrence to find gem grade hackmanite; at best, most crystals are translucent. Hackmanite is the light pink to pale violet variety of sodalite. It is a particularly unusual gem because it exhibits a special optical property known as "tenebrescence," a type of reversible photochromism. Hackmanite is very reactive under UV light.