Kunzite was named after George Frederick Kunz, noted author and gemologist for Tiffany. Kunzite is the pink variety of the mineral spodumene. The chemical formula is LiAlSi2O6. The crystal form is monoclinic and often found as flattened prismatic crystals. The hardness is 6.5-7.5. It has one directional cleavage and needs an experienced cutter to facet it. The refractive index is 1.653-1.670. The birefringence is 0.014-0.027. Kunzites are found in Brazil, Afghanistan, and California. It is called "Rose of the Nightquot; as people prefer to wear it at night fearing the color might fade in daylight. Strong heat and direct sunlight may cause kunzite to lose its colors. Kunzite has become a popular gemstone world wide.