White Moonstone

White Moonstone is the classic and most familiar form of moonstone, a feldspar gem treasured for adularescence, the soft, billowy glow that drifts across the surface like moonlight on water. It typically has a milky white to nearly colorless, translucent body.

The finest white moonstone, historically from Sri Lanka (Ceylon), shows a vivid blue sheen against a clear, almost transparent body, while more common material shows a silvery-white glow over a milkier base. The effect gives the stone an ethereal, luminous quality that has made it a favorite gem for centuries.

Most white moonstone is an orthoclase-albite feldspar; its glow comes from light scattering off microscopic intergrowths of the two feldspars (the adularia variety lends the name adularescence).

White Moonstone forms as feldspar crystallizing in igneous rocks such as pegmatites and granites. During slow cooling, orthoclase and albite feldspar unmix into alternating microscopic layers (exsolution lamellae); when light strikes these submicroscopic layers it scatters to produce the soft floating sheen of adularescence.

The finest blue-sheen white moonstone comes from Sri Lanka, with significant production from India, Myanmar, Madagascar, and elsewhere. The Swiss locality of Mt. Adular gave its name to the gem variety adularia and to the optical effect. Cutters orient cabochons so the sheen floats across the dome of the stone, maximizing the moonlight-like glow.

White Moonstone is a feldspar of Mohs 6-6.5 with two cleavages near 90 degrees and a vitreous to pearly luster. Its hallmark is a milky white to colorless translucent body with a soft blue or silver adularescent glow that floats and shifts as the stone is tilted; streak is white.

The sheen is a billowy internal light, distinct from labradorite's spectral flash or opal's play of color. Fine stones show a clear body with a strong blue glow.

Distinguish it from milky quartz and chalcedony (no adularescence, no feldspar cleavage) and from opal (which shows multicolor play of color). Glass and synthetic opal imitations lack the genuine billowy feldspar sheen.

White Moonstone is a long-popular gemstone, cut into cabochons, beads, and carvings for rings, pendants, earrings, and necklaces. It was especially prized in Art Nouveau and Victorian jewelry and remains a classic choice for its luminous glow. Fine blue-sheen Ceylon stones with transparent bodies command the highest prices.

As a feldspar with cleavage, it benefits from protective settings and gentle care to avoid scratches and chips.

In metaphysical traditions white moonstone is associated with intuition, femininity, new beginnings, and emotional balance, and it is regarded as a traditional birthstone for June; these are cultural and traditional beliefs rather than scientifically proven properties.