Blue Hackmanite 10mm Round - 15-16 Inch 48hr_five Norway where this type of

Norway where this type of igneous rock is found

with some transparent inclusions

Tranquilty

from light blue to lapis blue to cobalt

It also serves as the Mohs hardness scale index mineral for a hardness of 8

Blue Hackmanite 10mm Round - 15-16 Inch 48hr_five Norway where this type ofDiscovered 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.