Peach Moonstone
Orthoclase var. Moonstone (Feldspar variety) · Semi-Precious Gemstone
Crystal System
Monoclinic; typically occurs in massive or tumbled form rather than distinct large crystals in gem grade.
Mineral Group
Silicates; Tectosilicate (Feldspar Group)
Chemical Formula
(K,Na)AlSi3O8 (Potassium Aluminum Silicate)
Formation Process
Igneous/Metamorphic: Forms from cooling magma in pegmatites where slow cooling allows for the exsolution of orthoclase and albite layers.
About This Crystal
A warm, peachy-tan to orange-brown stone with a soft, vitreous to pearly luster. This tumbled specimen shows a semi-translucent body with internal white bands and a dark, possibly chlorite or tourmaline, vein-like inclusion.
Physical Characteristics
Color: Peach to salmon-pink; Streak: White; Cleavage: Perfect in two directions at 90 degrees; Fracture: Conchoidal to uneven; Specific Gravity: 2.56-2.59; Fluorescence: Weak orange or blue under UV.
Optical Properties
Displays adularescence (a soft floating glow caused by light scattering between microscopic layers of orthoclase and albite). Refractive Index: 1.518-1.526.
Hardness & Durability
Origin Region
Primarily Madagascar, India, Sri Lanka, and Tanzania. Found in pegmatite and metamorphic deposits.
Hardness & Durability
Mohs Hardness: 6.0 to 6.5. Fair toughness; vulnerable to pressure or hard knocks due to perfect cleavage.
Care & Maintenance
Clean with warm soapy water and a soft cloth. Avoid ultrasonic cleaners, steam, and harsh chemicals. Store separately from harder stones like quartz or sapphire to prevent scratching.
Rarity & Value
Relatively common; value is determined by the strength of the adularescence, color saturation, and clarity. Carved or high-glow pieces command higher prices.
Special Characteristics
Adularescence (the 'moonlight' glow effect) and occasional chatoyancy. This specific piece features a prominent dark linear inclusion, adding unique character.
Lore & History
Historically linked to the moon and feminine energy in many cultures. In modern crystal healing, it is associated with the Sacral and Heart chakras, thought to support emotional balance, creativity, and soothing stress.