Labradorite

The single most reliable identifier is labradorescence. Hold the stone under a directional light and slowly tilt it: a sheet of color, usually blue or green, will sweep across the surface and then vanish as you keep tilting, reappearing somewhere else. This is not surface color and it is not the rainbow you see on an oil slick or a soap bubble. It comes from light bouncing off microscopically thin, alternating layers inside the crystal (the result of the feldspar separating into two compositions as it cooled). Because the effect depends on the angle between your eye, the light, and those internal layers, a labradorite that flashes brilliantly in one orientation can look like a flat gray rock when you rotate it 90 degrees. If a stone shows that directional, angle-dependent flash, you are almost certainly looking at labradorite.

Look at the body color too. Labradorite is typically smoky gray, gunmetal, or near-black, which is exactly why the bright flash reads so strongly against it. A pale, milky, or white stone showing a soft floating glow is more likely moonstone (see look-alikes below).

Feldspar cleavage is the second confirmation. Labradorite breaks along two flat planes that meet at close to 90 degrees, so broken or sawn surfaces tend to be flat and reflective rather than curved and glassy like the conchoidal fracture of quartz. On a clean cleavage face you may also see fine, straight parallel lines called striations, a classic plagioclase feature.

Hardness is a useful tiebreaker. At Mohs 6 to 6.5, labradorite is hard enough to scratch glass with effort but will itself be scratched by a quartz point or a hardened steel file. It is noticeably less hard than quartz (7), which helps separate it from quartz-family stones that have no flash.

The body of labradorite ranges from light gray through smoky gray to a dark gunmetal that can look black in low light. Against that backdrop, the labradorescent flash is what people actually buy the stone for. Blue and green are the most common flash colors; gold and bronze are frequent; full-spectrum stones that also throw orange, red, and violet are scarcer and more sought after.

Spectrolite is a well-known variety, originally from Finland, in which a very dark, near-black body produces an unusually broad and vivid range of flash colors. The name is essentially a trade and varietal label for the best high-color material rather than a separate mineral; it is still labradorite.

"Rainbow moonstone" is a name often applied in the trade to a near-colorless feldspar that shows blue flash. Mineralogically much of that material is closer to labradorite than to true moonstone, which is one reason the naming gets confusing. The honest way to describe any of these stones is by the optical effect (labradorescence versus adularescence) and the feldspar species, rather than by trade names alone.

In crystal and metaphysical traditions, labradorite is often called a stone of transformation and protection, and its shifting flash makes it an easy symbol for change, intuition, and "hidden light." It is commonly associated with imagination, mental clarity, and shielding one's energy, and it shows up frequently in jewelry meant to feel grounding yet a little magical.

These associations are spiritual and cultural, not medical. Labradorite cannot diagnose, treat, prevent, or cure any physical or mental health condition, and nothing here should be taken as health advice. If you enjoy the stone for its symbolism or simply because the flash is beautiful, that is reason enough to own it; just do not substitute it for care from a qualified professional.

Labradorite is an affordable, widely available ornamental stone, and most pieces are inexpensive. What separates a cheap slab from a premium one is the quality of the flash: stones are valued for how bright the labradorescence is, how much of the surface lights up at once, how broad the color range is, and whether the flash appears across a wide viewing angle rather than only in a narrow sweet spot.

Full-spectrum material with strong blue-green-gold-to-orange flash on a dark body (the kind often labeled spectrolite) commands more than ordinary blue-only pieces. Cutting matters too, because a skilled cutter orients the stone so the internal layers face the surface and the flash fills the cabochon. Clean color, good polish, and the absence of distracting cracks all add value.

Labradorite needs gentle handling because it has good feldspar cleavage and will chip or split along flat planes if it takes a sharp knock. At Mohs 6 to 6.5 it is also softer than quartz and the everyday grit (largely quartz dust) that scratches jewelry, so it can dull or scuff over time if treated carelessly. Store it separately from harder stones, and take rings off before heavy or rough work.

Clean it with warm water, a drop of mild soap, and a soft cloth or soft brush, then dry it. Avoid ultrasonic and steam cleaners, which can find and worsen cleavage cracks, and keep the stone away from harsh chemicals, acids, and prolonged heat. Sudden temperature changes are also best avoided.