Labradorite is one of the best-known members of the feldspar group. It is famous for labradorescence, an optical effect that can produce vivid flashes of blue, green, gold, orange, red or violet when light reaches the stone from the right direction.

In this guide, we examine labradorite’s properties, composition, hardness and geological formation. We also explain how labradorescence works, what Finnish spectrolite is, how labradorite differs from rainbow moonstone and how to identify and care for the material.

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What is labradorite?

Labradorite is a calcium- and sodium-bearing plagioclase feldspar. Plagioclase is a continuous mineral series extending from sodium-rich albite to calcium-rich anorthite.

Labradorite occupies an intermediate, relatively calcium-rich part of this series. Its composition is commonly described as An50–An70, meaning that approximately 50–70 per cent of its feldspar component corresponds to the anorthite end member.

Labradorite is named after Labrador in present-day Newfoundland and Labrador, Canada. The mineral was described from material found around Paul Island in the Nain anorthosite complex.

The mineral itself can appear grey, colourless, pale green, bluish or nearly black. Its famous colours are usually not its body colour. They are an angle-dependent optical effect visible only when the internal structure, polished surface, light source and viewer are correctly aligned.

To explore its symbolic associations, read our separate guide to labradorite meaning.

Labradorite composition

Labradorite is a sodium-calcium aluminium silicate. A general formula can be written as (Ca,Na)[Al(Al,Si)Si₂O₈], although its precise calcium-to-sodium ratio varies within the accepted compositional range.

• Mineral group: feldspar
• Series: plagioclase feldspar
• Composition: calcium-sodium aluminium silicate
• Approximate range: An50–An70
• Crystal system: triclinic
• Streak: white
• Lustre: vitreous to sub-vitreous

Labradorite is not quartz, glass or an individual chemical compound with one completely fixed composition. Its position within the plagioclase series is defined by the relative proportions of albite and anorthite components.

The plagioclase feldspar series

Plagioclase feldspars form a compositional series between albite, NaAlSi₃O₈, and anorthite, CaAl₂Si₂O₈. Named ranges along this series include albite, oligoclase, andesine, labradorite, bytownite and anorthite.

These names describe different compositional intervals rather than completely unrelated minerals. Labradorite lies between andesine and bytownite.

This variable chemistry is important because the development of labradorescence depends partly on composition and cooling history. Not every piece of labradorite displays a strong optical effect.

How hard is labradorite?

Labradorite has a hardness of approximately 6–6.5 on the Mohs scale. It is harder than many decorative materials, including calcite and most obsidian, but slightly softer than quartz, which has a Mohs hardness of 7.

Labradorite can therefore be used in pendants, earrings, bracelets, cabochons, carvings and polished decorative pieces. However, hardness only measures resistance to scratching. It does not measure resistance to breaking.

Labradorite may be scratched by harder materials such as quartz, topaz, sapphire and diamond. Metal objects and household dust containing quartz grains can also gradually mark a polished surface.

Labradorite cleavage and durability

Like other feldspars, labradorite has well-developed cleavage. Cleavage is the tendency of a mineral to split along structurally weaker planes.

This means labradorite can fracture more readily than its hardness number might suggest. A polished stone may tolerate ordinary wear but still chip or split if it is dropped onto a hard floor or struck at an unfavourable angle.

• Protect it from hard knocks and falls.
• Remove labradorite rings before manual work.
• Do not store it loose with harder gemstones.
• Protect thin carvings and exposed cabochon edges.
• Transport larger specimens in padded packaging.

Pendants and earrings are generally less exposed to impact than rings. Labradorite bracelets can be worn regularly, but the beads may gradually scratch if repeatedly knocked against desks or harder jewellery.

How does labradorite form?

Labradorite crystallises as magma cools. It is commonly found in mafic and intermediate igneous rocks, including basalt, gabbro and norite, as well as in anorthosite.

Anorthosite is an intrusive igneous rock composed predominantly of plagioclase feldspar. Some large anorthosite bodies contain abundant labradorite crystals and are important sources of decorative material.

Labradorite may also occur in metamorphic rocks and in sediments derived from the weathering of feldspar-bearing rocks. Gem-quality material with strong labradorescence requires a suitable composition, internal structure and state of preservation.

Unlike obsidian, which is volcanic glass formed when lava cools too quickly for extensive crystal growth, labradorite has an ordered crystalline structure.

What is labradorescence?

Labradorescence is the iridescent optical effect for which labradorite is famous. It may appear as a broad flash, a concentrated patch of colour or several bands that move and disappear as the stone is tilted.

The effect can include:

• electric blue
• turquoise and green
• yellow and gold
• orange and copper
• red
• violet

The colours are structural. They do not come from blue, green or gold pigment distributed through the stone. This is why an apparently grey piece can suddenly display an intense blue flash.

What causes labradorescence?

Labradorescence is produced by an extremely fine internal lamellar structure. As suitable plagioclase cools slowly, components that were mixed at higher temperatures separate on a microscopic scale through a process known as exsolution.

This creates closely spaced layers with slightly different compositions and optical properties. When light enters the stone, reflections from these layers interfere with one another. Certain wavelengths reinforce each other while others are reduced.

The thickness and spacing of the lamellae influence the colours that appear:

• thinner structures tend to produce shorter-wavelength colours such as blue
• thicker structures can produce green, yellow, orange or red
• variations within one crystal may create several colours

Appropriate composition alone is not enough. The rock must also cool slowly enough for the nanoscale structure to develop. This is one reason why not every labradorite specimen shows labradorescence.

Is labradorescence the same as iridescence?

Labradorescence is a specialised type of iridescent or schiller effect associated with labradorite. Iridescence is a broader term describing changing spectral colours produced by structures in or on a material.

Labradorite’s colour effect occurs within the mineral rather than as a simple surface coating. Polishing reveals the effect, but the polish itself does not create the colours.

Why does the flash disappear at certain angles?

Light must reach the internal layers at a suitable orientation for strong interference colours to return towards the viewer. When the angle changes, the reflected wavelengths and direction of the light also change.

A labradorite can therefore look bright blue from one position and nearly colourless or grey from another. This directional behaviour is expected and is not a sign that the colour is wearing away.

When rough labradorite is cut, the lapidary must find the correct orientation before shaping and polishing it. Cutting at the wrong angle can leave an otherwise promising stone with little visible flash.

How labradorite is cut

Labradorite is commonly fashioned as a cabochon—a polished stone with a gently curved top and flat or slightly curved base. This shape provides a broad surface across which the labradorescence can move.

Before cutting, the rough is examined under direct light to locate the strongest colour plane. The cutter then orientates the face of the cabochon approximately parallel to that plane.

Deeply domed surfaces are not always necessary. A lower dome may show the optical effect particularly well while preserving more of the rough material.

Labradorite can also be carved into freeforms, towers, spheres and decorative objects. Because different areas of a specimen may flash at different angles, larger carvings can reveal changing colour as they are rotated.

What is spectrolite?

Spectrolite is a trade name traditionally used for particularly colourful labradorite from Finland. It occurs in anorthosite around Ylämaa in southeastern Finland.

Finnish spectrolite is known for strong colours that may span much of the visible spectrum. In addition to blue and green, high-quality pieces can show yellow, orange, red and violet against a dark body colour.

According to the Geological Survey of Finland, spectrolite was discovered in Ylämaa during the 1940s, and extraction began in the 1950s. It later became Finland’s best-known gemstone and is recognised as the provincial stone of South Karelia.

Mineralogically, spectrolite is labradorite-bearing plagioclase rather than a separate mineral species. The name describes the Finnish gem material and its characteristic optical quality.

Is every colourful labradorite spectrolite?

The word is sometimes used loosely in the international gemstone trade for any multicoloured labradorite. In its more precise and historically meaningful use, however, spectrolite refers to the Finnish material from the Ylämaa region.

A colourful specimen from Madagascar or Canada is still labradorite, but it should not automatically be presented as Finnish spectrolite. Locality information should be disclosed accurately when it forms part of a product’s description or value.

Labradorite and rainbow moonstone

Labradorite and moonstone both belong to the feldspar group, but their names can cause confusion.

Traditional moonstone is generally associated with potassium-rich feldspar and displays an optical effect called adularescence. This usually appears as a floating white or blue glow beneath the surface.

Material sold as rainbow moonstone is commonly a white or nearly colourless variety of calcium-rich plagioclase within the labradorite compositional range. It can show blue and multicoloured flashes, even though it is marketed with the moonstone name.

Rainbow moonstone is therefore often mineralogically labradorite rather than the same feldspar material as traditional orthoclase moonstone.

Labradorescence and adularescence

Labradorescence and adularescence are related structural optical effects, but they are not identical.

• Labradorescence: usually produces intense spectral colours from fine exsolution structures in plagioclase feldspar.
• Adularescence: usually appears as a white or blue floating glow created by light interacting with fine feldspar layers.

Gemstone trade names do not always follow strict mineralogical boundaries, which is why understanding both the name and the actual feldspar composition is useful.

Labradorite colours and appearance

Without its optical flash, labradorite may appear:

• medium to dark grey
• grey-green
• brownish grey
• blue-grey
• colourless or pale
• nearly black in some polished material

Fine internal lines, cleavage traces and darker mineral inclusions may be visible. Surface-reaching fissures are common in some material and do not necessarily mean that the stone is artificial.

Each piece appears different because the colour depends on internal lamellae, orientation, cutting and viewing conditions.

What determines labradorite quality?

There is no single formal grading system used by every seller. When evaluating decorative labradorite, buyers commonly consider:

• strength and brightness of the labradorescence
• range of visible colours
• size of the flashing area
• how easily the colour appears under ordinary lighting
• orientation and symmetry of the cut
• quality of the polish
• presence of distracting fractures or chips
• overall attractiveness of the pattern

A blue-only flash is not automatically inferior. A bright, well-positioned blue flash may be more attractive than a weak multicoloured effect.

Photographs should ideally show both the body colour and the flash. Strong studio lighting can make labradorescence appear more extensive than it does under diffuse indoor light.

Where is labradorite found?

Labradorite occurs in suitable igneous rocks around the world. Well-known sources include:

• Canada
• Finland
• Madagascar
• Norway
• Russia
• Ukraine
• Australia
• Mexico
• the United States

Madagascar is a major source of commercial cabochons, freeforms and carvings. Finland is renowned for spectrolite, while Labrador in Canada gave the mineral its name.

How to identify labradorite

The most recognisable feature is directional labradorescence within a feldspar body. Rotate the stone under a single light source and look for colour that appears to come from beneath the polished surface.

Typical characteristics include:

• a grey, pale or dark feldspar body colour
• one or more angle-dependent flashes
• blue, green, yellow, orange, red or violet colours
• fine internal lines or cleavage features
• a vitreous to sub-vitreous polished surface
• greater susceptibility to scratching than quartz

Visual inspection cannot prove composition or locality. Raman spectroscopy, refractive-index testing and other gemological methods may be required when precise identification matters.

Labradorite imitations and misleading names

Glass, coated stones, resin and printed composite materials can imitate labradorite’s colour. Some products use a reflective film beneath a transparent dome to create an intense blue or rainbow effect.

Possible warning signs include:

• colour that remains identical from every viewing angle
• a reflective effect confined to a surface coating
• round gas bubbles suggesting glass
• identical patterns repeated across several pieces
• a plastic-like feel or unusually low weight
• visible layers of adhesive or reflective film

Genuine labradorite can still display an exceptionally vivid flash, so colour intensity alone does not prove that a stone is artificial.

Is labradorite treated?

Most labradorite is cut and polished without colour treatment because labradorescence comes from its internal structure. Heating or dyeing cannot create the same natural lamellar optical effect in ordinary material.

Some stones may nevertheless be stabilised with resin, coated, backed with reflective material or assembled as composites. Surface-reaching fractures can also be filled to improve apparent clarity or durability.

Ask the seller about treatments or construction when purchasing valuable jewellery, unusually transparent material or a specimen with an exceptionally uniform effect.

How to clean labradorite

Labradorite should be cleaned gently because of its cleavage and susceptibility to impact.

• Use lukewarm water and a small amount of mild soap.
• Wipe with a clean cloth or a very soft brush.
• Rinse briefly and dry the stone completely.
• Avoid prolonged soaking.
• Avoid bleach, acids and abrasive cleaners.
• Do not use steam cleaning.
• Avoid ultrasonic cleaning, especially when fractures or fillings are present.
• Protect the stone from sudden temperature changes.

Ultrasonic vibration can aggravate existing fractures or cleavage weaknesses. A cloth and mild soap are usually sufficient for routine care.

How to store labradorite

Store labradorite separately in a padded box or fabric pouch. Harder materials such as quartz, amethyst, topaz, sapphire and diamond can scratch its polished surface.

Large freeforms and spheres should be placed on stable stands. Avoid shelves where they may roll, fall or be knocked against another specimen.

Labradorite does not require permanent exposure to sunlight to retain its optical effect. Labradorescence is structural rather than a charge that needs to be restored.

Labradorite in jewellery and decorative objects

Labradorite is popular in pendants, earrings, bracelets, cabochons and statement jewellery. A moving piece of jewellery can display the stone particularly well because the angle changes naturally during wear.

It is also fashioned into:

• polished palm stones
• freeforms
• spheres
• towers
• carvings
• decorative slabs

Browse labradorite stones, crystal jewellery and crystal pendants.

Labradorite meaning in crystal traditions

In contemporary crystal practice, labradorite is traditionally associated with intuition, creativity, confidence, protection and navigating change. Its changing appearance has contributed to symbolism involving hidden potential and seeing situations from another perspective.

These are cultural and spiritual associations rather than scientifically demonstrated effects. Labradorite does not create a protective field, predict events or produce psychic abilities.

It can instead function as a visual reminder of an intention, such as approaching change with curiosity or considering more than one point of view.

Stones connected with similar symbolic themes include amethyst, moonstone and obsidian.

Frequently asked questions about labradorite

Is labradorite a mineral?

Yes. Labradorite is a calcium-sodium plagioclase feldspar with a composition between albite and anorthite.

What is labradorite made of?

Labradorite is a calcium-sodium aluminium silicate. Its general formula can be written as (Ca,Na)[Al(Al,Si)Si₂O₈].

What is the hardness of labradorite?

Labradorite has a Mohs hardness of approximately 6–6.5.

Does labradorite break easily?

It is reasonably hard but has well-developed cleavage. A strong impact or fall can therefore chip or split it more easily than its hardness alone suggests.

Why does labradorite flash different colours?

Labradorescence is produced when light interacts with extremely fine compositional layers formed through exsolution inside the feldspar.

Are the blue colours caused by pigment?

No. The colour flashes are structural optical effects rather than blue pigment distributed through the mineral.

Why does my labradorite look grey?

Labradorite often has a grey body colour. Its flash appears only from suitable angles, so the same stone may look grey when the light or viewing direction changes.

Does every labradorite display labradorescence?

No. Strong labradorescence requires an appropriate composition, nanoscale lamellar structure, cooling history and cut orientation.

What is spectrolite?

Spectrolite is the trade name traditionally used for highly colourful Finnish labradorite from the Ylämaa region. It is labradorite rather than a separate mineral species.

Is spectrolite found only in Finland?

In precise trade usage, spectrolite refers to Finnish material. Multicoloured labradorite occurs elsewhere, but it should not automatically be labelled as Finnish spectrolite.

Is rainbow moonstone labradorite?

Material sold as rainbow moonstone is commonly a white or transparent calcium-rich plagioclase within the labradorite range. It is not necessarily the same feldspar material as traditional orthoclase moonstone.

Can labradorite be worn as jewellery?

Yes. It is suitable for many jewellery designs, although it should be protected from scratches, hard impacts and pressure along its cleavage planes.

Can labradorite go in water?

Brief cleaning with lukewarm water is generally suitable for untreated, intact labradorite. Avoid prolonged soaking, particularly when the stone is fractured, filled, glued or mounted in jewellery.

Is labradorite naturally colourful?

Yes. Genuine labradorescence is a natural structural effect. The visible flash is produced by light interference within the mineral.

Summary: labradorite’s principal properties

• Labradorite belongs to the plagioclase feldspar series.
• Its composition lies between sodium-rich albite and calcium-rich anorthite.
• It has a Mohs hardness of approximately 6–6.5.
• Its cleavage makes it more vulnerable to impact than hardness alone suggests.
• Labradorescence is produced by light interacting with nanoscale exsolution lamellae.
• The flash can include blue, green, yellow, orange, red and violet.
• Spectrolite is the trade name traditionally used for colourful Finnish labradorite.
• Rainbow moonstone is commonly white plagioclase within the labradorite compositional range.

Labradorite is an excellent example of how a mineral’s internal structure can transform ordinary-looking material into an extraordinary optical display. Its colours do not simply sit on the surface: they emerge from the interaction of light with microscopic layers created during the feldspar’s geological history.

Explore labradorite at Amethyst Cat