Peristerite

Peristerite is a variety of feldspar that contains inclusions of exsolved lamellae of albite within a host of orthoclase or oligoclase. This unique structure gives peristerite its distinctive iridescence, with colors ranging from blue and green to pink and yellow.

Peristerite is commonly found in granitic rocks and pegmatites around the world. Some notable locations where peristerite can be found include Norway, Madagascar, and the United States. The mineral is often associated with other feldspar varieties and gemstones.

Peristerite has a hardness of 6-6.5 on the Mohs scale, making it relatively durable for use in jewelry and ornamental pieces. Its iridescence is caused by the interference of light between the thin layers of albite inclusions, creating a play of colors known as labradorescence.

Due to its striking iridescence, peristerite is often used in jewelry and lapidary work. It is cut into cabochons, beads, and other ornamental pieces to showcase its unique colors and play of light. Peristerite is also prized by collectors for its rarity and beauty.