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Historically
It has been discovered with artifacts from cultures of the Neolithic Period
the second-hardest mineral next to diamond
It is a phyllosilicate composed of silicon
Blue Hackmanite 8mm Round - 15-16 Inch Price $7-$50 HistoricallyDiscovered 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.
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