Feldspar Group
Labradorite
Labradorite is a plagioclase feldspar whose grey, unremarkable-looking base hides a striking optical trick: tilt it and flashes of electric blue, green, gold, or orange sweep across the surface, an effect called labradorescence. That flash comes from the same broad family of phenomena as moonstone's softer glow, but on a coarser internal scale, which is why labradorite produces sharp, switching color flashes instead of a diffuse shimmer. The stone was first described to Western science in 1770 by Moravian missionaries in Labrador, Canada, who learned of it from Inuit communities already using it.
The geology — what Labradorite actually is
- Mineral class
- Silicate (feldspar group — plagioclase series)
- Chemical formula
- (Ca,Na)(Al,Si)4O8
- Crystal system
- Triclinic
- Mohs hardness
- 6 to 6.5
What causes the color: Labradorescence — the flash of blue, green, gold, or orange — comes from light interference off thin, alternating internal layers (lamellae) that form during slow cooling, a process called exsolution. The specific flash color depends on the thickness of these layers, which is why individual specimens can flash quite different colors from one another.
How it forms: Forms in mafic igneous rocks (gabbro, basalt, anorthosite) that cool slowly enough underground to allow the internal lamellar layering responsible for labradorescence to develop; rapid cooling doesn't allow this structure to form.
- Labrador, Canada (the namesake locality, first described to Western science in 1770)
- Madagascar (a major modern commercial source)
- Finland (fine material with an especially wide color range is traded under the name spectrolite)
- Ukraine (Volyn region)
Treatments & imitations: Generally untreated, since labradorescence is a stable natural structural effect. Sometimes imitated with foil-backed or specially coated glass designed to mimic a constant iridescent sheen.
Real vs. fake: Genuine labradorescence appears and disappears distinctly as the stone is tilted — the flash essentially switches on and off from specific angles rather than glowing continuously. Foil-backed or coated glass imitations tend to show a more constant, uniform iridescent sheen from nearly any angle, lacking that sharp on/off quality.
The tradition — how people use Labradorite
Historical use: Inuit communities in Labrador, Canada valued and used the stone before it was documented by Moravian missionaries in 1770, who introduced it to Western mineralogy under the name of the region where it was found; it entered wider European jewelry and decorative use through the 19th and 20th centuries.
Metaphysical tradition: Third-eye work in modern crystal-healing tradition leans on labradorite as a stone of intuition and transformation, sometimes called a 'stone of magic' for the way its hidden flash only reveals itself from certain angles.
How to use it: Frequently worn as jewelry (rings and pendants that catch light as you move), carried during periods of change or major decision-making, or used as a meditation focal point.
Cleansing & care: Labradorite shares the feldspar family's internal cleavage planes, so a sharp knock can chip it even though Mohs 6-6.5 sounds reasonably tough on paper. A brief rinse is fine, but skip the ultrasonic cleaner — the vibration can stress the thin internal lamellae that produce its flash.
Frequently asked questions
Why does labradorite flash sharply while moonstone just glows softly?
It comes down to layer thickness and spacing within the two stones' internal lamellae: labradorite's layers are thicker and more coarsely spaced, which interferes with light in a way that produces a sharp, switch-like flash concentrated at specific angles, while moonstone's much finer, more closely-spaced layering scatters light more diffusely into a soft, moving glow instead of a distinct flash. Same underlying exsolution process, different resulting optics purely from how fine the layering turned out.
What is spectrolite?
Spectrolite is a trade name for especially fine labradorite from Finland, prized for showing an unusually wide range of flash colors across a single specimen compared to typical labradorite from other localities.
Why does labradorite look grey until you move it?
Its base color is a fairly plain grey-to-black feldspar; the colorful flash only appears when light hits the internal lamellar layers at specific angles, which is why the stone can look unremarkable in one position and vivid the moment you tilt it.
Related crystals
Moonstone
Feldspar Group
Moonstone is a variety of feldspar — specifically orthoclase or, in the finest material, adularia — and the soft, floating blue-white glow it's named for (called adularescence) isn't a surface coating or dye at all: it's an optical effect caused by light scattering off microscopically thin, alternating layers of two different feldspar minerals that separated inside the crystal as it cooled slowly underground, a process mineralogists call exsolution.
Selenite
Gypsum Family
Selenite is the clear-to-white, fibrous or bladed variety of gypsum — calcium sulfate dihydrate — and it's the single softest crystal commonly sold in the crystal trade: at Mohs 2, it's soft enough to scratch with a fingernail, which is both its most distinctive identifying feature and the reason it needs genuinely different care than the quartz-family stones most people are used to. Its name comes from Selene, the Greek moon goddess, for its pale, softly glowing luster.
Amazonite
Feldspar Group
Amazonite is a blue-green variety of microcline, a potassium feldspar, and despite its name it doesn't actually occur in the Amazon rainforest region — the naming is a long-standing mineralogical mix-up, possibly from early confusion with green stones traded by Indigenous peoples along the Amazon River that were more likely nephrite jade. Its color was long attributed to copper (which would make sense given the name), but more recent mineralogical research points instead to trace lead and water content interacting with the feldspar's structure.
Fluorite
Halide Group
Fluorite has one of the simplest chemical formulas of any common gem mineral — just calcium and fluorine — yet it comes in more colors than almost any other single mineral species: purple, green, blue, yellow, colorless, and often several bands of color in one specimen. It's also the mineral that gave science the word 'fluorescence,' since many fluorite specimens glow vividly under ultraviolet light, a property discovered and named from studying this exact stone in the 19th century.
Where to buy Labradorite
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Specialty mineral dealers & gem shows
The most reliable source for anything beyond common tumbled stones — sellers who specialize in minerals tend to disclose treatments and localities unprompted, because their repeat customers ask.
GIA/AGS-affiliated jewelers
For cut gemstones meant for jewelry (not raw specimens), a seller who can produce or reference an independent lab report (GIA, AGS) removes almost all of the real-vs-fake guesswork.
Marketplace sellers with a track record
Etsy and similar marketplaces host genuine small mineral dealers alongside mislabeled resin castings — check seller reviews specifically for photos of received items, not just star ratings.
Local rock & gem shops
Being able to handle a piece before buying lets you apply the weight and hardness checks described on each stone's own page — something no photo can substitute for.
Whichever seller you choose, ask directly whether the stone is natural or synthetic, and whether it's been treated (heated, dyed, irradiated) — a straightforward answer is the single best signal of a trustworthy seller, more useful than any star rating.
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Sources and factual basis for the geology above: see our methodology.