Kunzite
Spodumene var. Kunzite · Semi-Precious Gemstone / Collector Mineral.
Crystal System
Monoclinic; typically forms in long, flattened prismatic crystals with deep vertical striations. This specimen is a tumbled/polished pebble.
Mineral Group
Silicates; specifically Inosilicates (pyroxene group).
Chemical Formula
LiAlSi2O6 (Lithium Aluminum Silicate) with trace amounts of Mn3+ (manganese) causing the pink/lilac color.
Formation Process
Igneous formation; crystallizes in lithium-rich granitic pegmatites during the final stages of magmatic differentiation under high pressure and temperature.
About This Crystal
A translucent to transparent pink to lilac gemstone. This tumbled specimen shows a soft, vitreous to pearly luster with visible internal cleavage planes and slight 'silky' shimmer characteristic of spodumene.
Physical Characteristics
Color: Pink to violet; Streak: White; Cleavage: Perfect in two directions (prismatic) at 87 and 93 degrees; Fracture: Splintery to uneven; Specific Gravity: 3.16–3.20; Fluorescence: Often strong orange to pink under Long Wave UV.
Optical Properties
Refractive Index: 1.660–1.676; Birefringence: 0.014–0.016; Pleochroism: Strong (trichroic: pink, violet, and colorless); Biaxial (+); Doubly refractive.
Hardness & Durability
Origin Region
Notable sources include Afghanistan (Nuristan), Pakistan, Brazil (Minas Gerais), and the United States (California). It typically forms in Li-rich granite pegmatites.
Hardness & Durability
Mohs Hardness: 6.5 to 7.0. It is brittle with perfect cleavage, making it difficult to cut and susceptible to damage from hard knocks (relatively low toughness).
Care & Maintenance
Avoid ultrasonic and steam cleaners. Clean with warm soapy water and a soft cloth. Keep away from direct sunlight and high heat, as prolonged exposure can cause the color to fade ('evening stone').
Rarity & Value
Relatively uncommon. Value is determined by color intensity (deeper pink/violet is more valuable), clarity, and size. Frequently irradiated or heat-treated to enhance color.
Special Characteristics
Strongly pleochroic, meaning it displays different colors when viewed from different angles. It is known as the 'evening stone' because its color can fade in UV light.
Lore & History
Discovered in 1902 and named after gemologist George Frederick Kunz of Tiffany & Co. Traditionally associated with the heart chakra, it is believed by healers to represent emotional peace, unconditional love, and the release of stress.