Yellow and White Moonstone
Feldspar Group, Orthoclase/Albite Intergrowth var. Moonstone · Semi-Precious Gemstone
Crystal System
Monoclinic, typically tumbled and polished into smooth, rounded shapes with remnants of blocky habit
Mineral Group
Silicates, specifically Tectosilicates (Feldspar group)
Chemical Formula
(K,Na)AlSi3O8
Formation Process
Igneous and pegmatitic formation, where alkali feldspars cool slowly, allowing sodium-rich albite and potassium-rich orthoclase to separate into microscopic alternating layers
About This Crystal
A collection of tumbled, smooth, and rounded gemstone beads or pebbles displaying shades of pale yellow, honey-yellow, and milky white. The stones are translucent to semi-translucent with a vitreous to pearly luster. One prominent stone at the bottom shows a distinct chatoyant band (cat's-eye effect), while others display soft adularescence.
Physical Characteristics
Color ranges from pale yellow to translucent white; white streak; cleavage is perfect in two directions at or near 90 degrees; uneven to conchoidal fracture; specific gravity around 2.56-2.58; brittle tenacity; exhibits faint yellowish or bluish fluorescence under UV light depending on trace impurities.
Optical Properties
Biaxial negative optical character with a refractive index between 1.518 and 1.526; low birefringence; exhibits strong adularescence (schiller effect) caused by light scattering between microscopic alternating layers of orthoclase and albite; occasional chatoyancy.
Hardness & Durability
Origin Region
Sri Lanka, India, Madagascar, Myanmar, and the United States
Hardness & Durability
Mohs hardness of 6 to 6.5; fair to good durability but vulnerable to cleavage planes if struck sharply; moderate wearability for jewelry, best suited for earrings, pendants, or protected ring settings.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid ultrasonic cleaners, harsh chemicals, and steam cleaning; store separately in a fabric-lined box away from harder gemstones like quartz or topaz to prevent scratching.
Rarity & Value
Common to moderately rare depending on the intensity of adularescence, body color, and clarity; high-quality specimens with strong blue adularescence or chatoyancy command higher prices; generally affordable in tumbled forms.
Special Characteristics
Displays adularescence, a floating billowy ball of light or glow that moves across the surface as the stone is turned, and potential chatoyancy (cat's eye effect) due to fine needle-like inclusions or structural lamellae.
Lore & History
Historically associated with lunar deities in ancient Roman, Greek, and Indian cultures, where it was believed to be solidified moonlight. In crystal healing lore, moonstone is tied to the sacral and third-eye chakras, symbolizing intuition, emotional balance, new beginnings, and feminine energy (these are traditional cultural beliefs, not scientifically proven claims).