Moonstone
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Named for a floating, billowing glow called adularescence, moonstone is a feldspar, chiefly orthoclase or adularia, whose blue-white to silver sheen drifts across the surface as the stone is tilted, an effect of light scattering between alternating layers of orthoclase and albite. The finest blue adularescent material originates in Sri Lanka, including Ratnapura and Mogok, while rainbow moonstone, actually labradorite, comes from India, and peach-orange stones from Tanzania. Crystallizing in the monoclinic system, it measures 6.0 to 6.5 on the Mohs scale. Worn as a talisman in Roman and Indian traditions for over two thousand years, this moderately priced semi-precious stone is one of three June birthstones.
Physical & Optical Properties
Category
Semi-Precious Gems
Mohs Hardness
6.0 – 6.5
Specific Gravity
2.56 – 2.6
Refractive Index
1.518 – 1.527
Crystal System
Monoclinic
Luster
Vitreous
Cleavage
Perfect
Fracture
Uneven,Conchoidal
Color
white
Birefringence
0.006
Pleochroism
Absent
Mohs Hardness
| Mohs | Reference mineral | Moonstone |
|---|---|---|
| 1 | Talc | |
| 2 | Gypsum | |
| 3 | Calcite | |
| 4 | Fluorite | |
| 5 | Apatite | |
| 6 | Orthoclase | ● |
| 7 | Quartz | |
| 8 | Topaz | |
| 9 | Corundum | |
| 10 | Diamond |
Crystal System
Value & Market
Price Tier
Moderate ($50-500/ct)
Where to Buy Moonstone
Blue Nile
Fine jewelry retailer
James Allen
Gemstone jewelry
Brilliant Earth
Ethically sourced gems
Amazon
Wide selection
Links may earn a commission at no extra cost to you.
Cultural Significance
Birthstone Month
6 (alternative)
About Moonstone
ムーンストーン（月長石）は、正長石と曹長石の薄層が交互に重なったアルカリ長石の一種で、幻想的な青白い光のゆらめき（アドラレセンス）が特徴です。スリランカ・インド・マダガスカルが主要産地で、青い輝きを持つスリランカ産が最高品質とされます。古代より月の宝石として珍重され、アーツ・アンド・クラフツ運動期にアールヌーヴォーの宝飾作家に愛用されたほか、6月の誕生石の一つです。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Moonstone?
ムーンストーン（月長石）は、正長石と曹長石の薄層が交互に重なったアルカリ長石の一種で、幻想的な青白い光のゆらめき（アドラレセンス）が特徴です。スリランカ・インド・マダガスカルが主要産地で、青い輝きを持つスリランカ産が最高品質とされます。古代より月の宝石として珍重され、アーツ・アンド・クラフツ運動期にアールヌーヴォーの宝飾作家に愛用されたほか、6月の誕生石の一つです。
What is the hardness of Moonstone?
Moonstone has a Mohs hardness of 6.0 to 6.5, making it moderate for use in jewelry.
What color is Moonstone?
Moonstone is primarily White.
Where is Moonstone found?
Moonstone is found in Mogok (Myanmar), Sri Lanka (Ceylon) (Sri Lanka), Ratnapura (Sri Lanka).
How much does Moonstone cost?
Moonstone falls into the Moderate ($50-500/ct) price range. Prices vary based on color, clarity, cut, and origin.