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 hardness of Moonstone shown against the ten reference minerals, from talc (1) to diamond (10).

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

Pedra-da-Lua é uma variedade de feldspato de potássio famosa pelo seu fenómeno adularescência — um brilho azul ou branco flutuante que parece mover-se ao longo da superfície da pedra como luz da lua numa nuvem. Venerada em muitas culturas como portadora de energia lunar, tem sido usada em joalharia durante séculos. A mais valorizada exibe um brilho azul profundo sobre fundo transparente. As melhores pedras-da-lua provêm do Sri Lanka, seguido da Índia e de Myanmar. A pedra de junho por excelência, continua a ser uma das gemas de fenómeno mais apreciadas do mundo.