Blue Hackmanite 10mm Round - 15-16 Inch Gray green and yellow with white

green and yellow with white and gray inclusions

They are all silicate minerals

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

This is due to high oscillating frequency and thermal conductivity

Blue Hackmanite 10mm Round - 15-16 Inch Gray green and yellow with whiteDiscovered 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.