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: 6,0 – 6,5

1 Soft10 Hard

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

El feldespato luna es una variedad de feldespato potásico —típicamente adularia— célebre por su ondulante brillo interno blanco azulado, el fenómeno óptico denominado adularescencia, producido por la reflexión de la luz entre finas capas alternas de ortoclasa y albita. Ha sido adorado durante milenios en la India como piedra sagrada ligada a la luna, y en Europa fue muy popular durante el Art Nouveau. Las mejores piezas transparentes con adularescencia azul provienen de Sri Lanka, mientras que Myanmar e India aportan variedades más opacas con efecto ojo de gato.