Blue Kyanite 10mm Round - 15-16 Inch Inc. The inclusions are of manganese

The inclusions are of manganese or iron

Trolleite is an extremely rare aluminum phosphate mineral that crystallizes in the form of masses and small prismatic crystals

AKA- Norena Jasper

Gamma ray irradiation

A variety of Andalusite

Blue Kyanite 10mm Round - 15-16 Inch Inc. The inclusions are of manganeseKyanite often occurs as long, bladed, striated crystals, transparent or translucent with a pearly luster. An aluminum silicate mineral, it may appear in white, pink, yellow, orange, green, blue, gray and black. In addition to its value as a gemstone, Kyanite is also extremely useful in industrial applications due to its high heat resistance. It is often used in kiln furniture and foundry molds, as well as for brake shoes, grinding wheels and cutting