Moonstone and Labradorite: Adularescence vs Labradorescence, Spotting Genuine Stones and Care

September 03, 2026

Moonstone and labradorite are both feldspars, but they show two different optical effects and the words are not interchangeable. Moonstone shows adularescence: a soft, billowy blue-white glow that seems to float below the surface and move as you tilt the stone. Labradorite shows labradorescence: distinct flashes of blue, green, gold or orange that switch on at particular angles and vanish at others. Both sit around 6 to 6.5 on the Mohs scale with two directions of perfect cleavage, which means both chip readily and neither belongs anywhere near an ultrasonic cleaner.

Two feldspars, two effects

Feldspars are the most abundant mineral group in the earth's crust, and the family splits into two branches. Moonstone belongs to the alkali branch, an intergrowth of orthoclase and albite. Labradorite belongs to the plagioclase branch, sitting in the calcium-sodium series. Both owe their beauty to the same underlying situation: two slightly different materials interleaved in microscopically thin layers inside a single stone, so that light entering the stone interacts with those layers rather than simply passing through.

The layers differ in scale and arrangement, and that is what produces two visibly different effects. In moonstone the lamellae are fine enough to scatter the shorter blue wavelengths, giving a diffuse glow. In labradorite the lamellar intergrowth is coarser and light interferes across it, giving saturated spectral colour. This is why one looks like moonlight on water and the other looks like oil on a puddle.

Adularescence and labradorescence compared

What adularescence actually is

When the orthoclase and albite in a moonstone separate as the stone cools, they form alternating layers only a few hundred nanometres thick. Light entering the stone is scattered at those boundaries, and because shorter wavelengths scatter more readily, the returned light is biased toward blue. The effect appears to sit some distance beneath the polished surface, which is why the glow seems to hover inside rather than sit on top.

The practical consequence is that adularescence is directional. There is one orientation in which the sheen is strongest, and a good cutter orients the cabochon so that the glow sits centred and rolls smoothly when the stone is tilted toward the viewer. A moonstone cut off-axis will look grey and lifeless no matter how fine the rough was.

What labradorescence actually is

In labradorite the plagioclase separates into alternating lamellae on a coarser scale. Light reflecting from successive layers interferes, reinforcing some wavelengths and cancelling others, which is why the colour is saturated and spectral rather than diffuse and blue. It is the same physics that colours a soap bubble.

Because the lamellae lie in a definite plane inside the stone, the flash appears only when that plane is correctly presented to both the light source and the eye. Turn the stone a few degrees and the whole face ignites at once; turn it a few more and it goes dull grey. That switching behaviour, rather than the colour itself, is the reliable identifier. Compare it with the single moving band of chatoyancy described in our guide to tiger eye, and with the scattered glitter of aventurescence in green aventurine. Three effects, three different causes, three different names.

The rainbow moonstone confusion

Rainbow moonstone is a trade name, and it is worth knowing that the material sold under it is usually a white labradorite rather than an alkali feldspar moonstone. It is a genuine natural stone and there is nothing dishonest about liking it, but if you are buying on the strength of the word moonstone it is fair to ask a seller which feldspar the stone actually is. Similarly, the peach and grey stones sold as moonstone vary in how much sheen they carry, and some carry almost none.

How to check each one is genuine

1. Move the stone, do not just look at it. Both effects depend on angle. Tilt slowly under a single light source. A static appearance that does not change as you move is the clearest sign of a printed, coated or foil-backed imitation.
2. For moonstone, watch how the glow travels. Genuine adularescence drifts across the stone like light under ice. Opalite, a manufactured glass sold as moonstone, glows a milky blue in reflected light and a warm orange when held against a light, and the effect sits on the surface rather than within.
3. For moonstone, look for internal texture. Natural material commonly shows fine stress cracks, sometimes called centipede inclusions, and visible cleavage planes. A stone with absolutely nothing inside it, and perhaps a round gas bubble, is glass.
4. For labradorite, check the switch. A genuine stone flashes as a whole plane and then goes grey. Imitations glitter continuously from every angle, because the sparkle has been added to the surface rather than grown into the stone.
5. For labradorite, look at the body colour. Away from the flash it should be a plain grey to dark grey. A stone that is uniformly bright with no dull position is suspect.
6. Ask about coatings. Aura or mystic coatings apply a fine metallic vapour layer to a real stone. That is a treatment, not a fake, but it should be disclosed and it changes how the piece must be cared for.
7. Ask what the stone is in writing. Feldspar variety, whether natural or coated, and country of origin if the seller knows it.

Care, and why both of these chip

This is the part that matters most in daily use. Feldspars have two directions of perfect cleavage meeting at close to a right angle, which means that a sharp knock can split the stone along an internal plane rather than merely scuffing it. At 6 to 6.5 they are also softer than quartz, so ordinary household dust, which contains quartz, will dull a polished surface over time.

• Never use an ultrasonic or steam cleaner. Vibration and heat find cleavage planes. This is the single most common way good moonstone and labradorite are destroyed.
• Avoid sudden temperature change. Do not move a piece from cold water to hot, and do not leave it on a sunny dashboard.
• Clean gently. Lukewarm water, a drop of mild soap, a soft brush, then pat dry. Do not soak a piece that is glued into a setting.
• No salt. Dry salt is abrasive and salt water is worse. The gentler methods in our guide to cleansing and charging crystals are more appropriate here, and our note on selenite and water covers a stone that is even more sensitive.
• Store separately and wrapped. Not loose in a box with quartz, agate or metal.
• Take it off first. For housework, the gym, gardening and swimming. A pendant survives daily wear far better than a ring or a bangle, simply because it takes fewer knocks.
• Coated stones need more care still. The coating is a thin surface layer and abrasives, solvents and prolonged rubbing will wear it away.

Who wears them

Neither stone is one of the navaratna. Moonstone is sometimes offered in Indian retail as an uparatna, a secondary stone, in place of a pearl where the moon is concerned, and labradorite has no classical position at all and comes to India largely through modern crystal traditions, in which it is associated with intuition and transformation. Both of those are beliefs held within living traditions and are described here as such, with no outcome promised or implied. Anyone selecting a stone for a specific astrological purpose should consult a qualified astrologer with their own chart rather than choosing by colour or by a general chart. Our rashi stone chart sets out the classical associations, and both stones appear among our gemstones and in gemstone jewellery.

Moonstone and Labradorite: Frequently Asked Questions

What is the difference between adularescence and labradorescence?

Adularescence is the soft, billowy blue-white glow of moonstone, caused by light scattering off very fine alternating layers of orthoclase and albite. Labradorescence is the flash of saturated spectral colour in labradorite, caused by light interference across a coarser lamellar intergrowth in plagioclase feldspar. One drifts and hovers; the other switches on and off. They are different optical effects and the words are not interchangeable.

Are moonstone and labradorite the same mineral?

Both are feldspars but from different branches of the family. Moonstone is an alkali feldspar, an intergrowth of orthoclase and albite. Labradorite is a plagioclase feldspar in the calcium-sodium series. They share a hardness of about 6 to 6.5 and two directions of perfect cleavage, which is why the care advice for the two is almost identical.

Is rainbow moonstone actually moonstone?

Usually not, in the strict sense. The material sold as rainbow moonstone is generally a white labradorite rather than an alkali feldspar moonstone. It is a genuine natural stone and there is nothing wrong with buying it, but if the name moonstone matters to you it is fair to ask a seller which feldspar the stone actually is.

How can I tell a real moonstone from opalite?

Opalite is a manufactured glass. It glows milky blue in reflected light and warm orange when held against a light, and the effect sits on the surface rather than floating within the stone. Genuine moonstone shows a glow that drifts as you tilt it, and usually contains fine internal stress cracks and visible cleavage planes. A stone with nothing at all inside it, or with a round gas bubble, is glass.

How do I know a labradorite is genuine?

Watch how it behaves as you turn it. A genuine stone lights up across a whole plane at one angle and then goes plain grey at another. An imitation glitters continuously from every direction, because the sparkle has been applied to the surface rather than grown into the stone. Away from the flash, real labradorite has an unremarkable grey to dark grey body colour.

Why do moonstone and labradorite chip so easily?

Because feldspars have two directions of perfect cleavage meeting at close to a right angle, so a knock can split the stone along an internal plane rather than just scuffing the surface. At 6 to 6.5 on the Mohs scale they are also softer than quartz, and ordinary household dust contains quartz, so polished surfaces gradually dull with careless storage.

Can I clean them in an ultrasonic cleaner?

No. Vibration and heat find cleavage planes, and an ultrasonic or steam cleaner is the most common way a good moonstone or labradorite is ruined. Use lukewarm water with a drop of mild soap and a soft brush, then pat dry. Avoid sudden temperature changes, avoid salt in any form, and do not soak a stone that is glued into its setting.

What is an aura or mystic coating?

It is a very thin metallic vapour layer applied to the surface of a real stone to produce an iridescent finish. It is a treatment rather than a fake, and it is perfectly acceptable when disclosed, but it changes how the piece must be handled. Abrasives, solvents and prolonged rubbing will wear the coating away, so coated stones need gentler cleaning than untreated ones.