mineral

Moonstone (Rainbow Moonstone)

Labradorite (White Labradorite) - (Na,Ca)(Al,Si)4O8

Hardness: 6-6.5 Mohs, Color: White or colorless with blue/rainbow labradorescence, Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific Gravity: 2.56-2.59

Hardness: 6-6

Identified May 25, 2026More mineral →

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Physical properties

Hardness: 6-6.5 Mohs, Color: White or colorless with blue/rainbow labradorescence, Luster: Vitreous to pearly, Crystal structure: Triclinic, Specific Gravity: 2.56-2.59

Formation & geological history

Formed in plutonic and volcanic igneous rocks through a cooling process where different types of feldspar separate into thin layers. This specific variety is a type of translucent feldspar that exhibits an optical phenomenon.

Uses & applications

Primarily used in jewelry (cabochons, beads, rings) and as a decorative or metaphysical gemstone for collectors.

Geological facts

While commonly called 'Moonstone', Rainbow Moonstone is technically a white variety of Labradorite. The blue flash is caused by light scattering off of internal layers of different feldspar minerals.

Field identification & locations

Identified by a characteristic blue or multi-colored 'flash' (adularescence/labradorescence) when rotated under a light source. Found in Madagascar, India, and Sri Lanka.

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Mineral/Rock

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Metamorphic Rock

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mineral