gemstone

Rainbow Moonstone

White Labradorite (Plagioclase Feldspar, (Na,Ca)(Al,Si)4O8)

Hardness: 6-6.5 on Mohs scale; Color: Semi-translucent white with characteristic blue/rainbow adularescence; Luster: Vitreous to pearly; Crystal System: Triclinic; Cleavage: Perfect in two directions.

Hardness: 6-6
Luster: Vitreous to pearly

Identified July 28, 2026More gemstone →

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Physical properties

Formation & geological history

Forms in igneous rocks like pegmatites and metamorphic rocks as feldspar crystals cool slowly, creating microscopic exsolution lamellae that cause light scattering (schiller or adularescence). Found extensively in Sri Lanka, India, Madagascar, and Myanmar.

Uses & applications

Popularly used in fine and fashion jewelry (carved pendants, beads, cabochons, rings), ornamental carvings, and by mineral collectors and lapidary enthusiasts.

Geological facts

Despite being named 'Rainbow Moonstone', it is technically a variety of white labradorite rather than a true orthoclase moonstone. The iridescent schiller effect is caused by light diffracting between thin alternating feldspar layers.

Field identification & locations

Identified by its translucent white body and bright, flash-like blue or multicolored metallic sheen when rotated under light. Often carved into crescent moons, stars, or cabochons.

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