Blue Hackmanite 10mm Round - 15-16 Inch Gray This is due to high

This is due to high oscillating frequency and thermal conductivity

Blood Quartz is a clear to milky to white silicon dioxide mineral

green and yellow with white and gray inclusions

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

It is known for its colors to to dark green and mustardy yellow

Blue Hackmanite 10mm Round - 15-16 Inch Gray This is due to highDiscovered 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.