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
月光石是长石族中正长石（或冰长石）的宝石变种，以其独特的月光效应（adularescence）著称，呈现出如月光般柔和飘移的蓝白色光晕，这是由内部交替层叠的正长石和钠长石薄层对光的散射干涉产生的。斯里兰卡是月光石最重要的产地，所产蓝色月光效应月光石质量最优；印度产猫眼月光石和彩虹月光石（拉布拉多石）；缅甸和坦桑尼亚亦有出产。月光石为六月诞生石之一，自罗马时代起便被认为与月亮神明相关联，在各文化中均有月亮与神秘之意。摩氏硬度6至6.5，有两组解理，日常佩戴需注意保护。
On this page
Jewelry Use
Durability
5/10
Science FYI Family
Frequently Asked Questions
What is Moonstone?
月光石是长石族中正长石（或冰长石）的宝石变种，以其独特的月光效应（adularescence）著称，呈现出如月光般柔和飘移的蓝白色光晕，这是由内部交替层叠的正长石和钠长石薄层对光的散射干涉产生的。斯里兰卡是月光石最重要的产地，所产蓝色月光效应月光石质量最优；印度产猫眼月光石和彩虹月光石（拉布拉多石）；缅甸和坦桑尼亚亦有出产。月光石为六月诞生石之一，自罗马时代起便被认为与月亮神明相关联，在各文化中均有月亮与神秘之意。摩氏硬度6至6.5，有两组解理，日常佩戴需注意保护。
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.