mineral

Rainbow Moonstone

White Labradorite (formula: (Na,Ca)(Al,Si)4O8)

Hardness: 6-6.5 Mohs; Color: White or colorless with blue/rainbow 'adularescence'; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions; Specific Gravity: 2.6 – 2.7

Hardness: 6-6
Color: White or colorless with blue/rainbow 'adularescence'
Luster: Vitreous to pearly

Identified March 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed in both igneous and metamorphic rocks via the cooling of mineral-rich fluids. It specifically develops through the alternating intergrowth of orthoclase and albite, which creates the light-scattering effect.

Uses & applications

Primarily used as a gemstone in necklaces, rings, and earrings. It is also highly sought after by metaphysical collectors and for lapidary arts.

Geological facts

Despite its common name, 'Rainbow Moonstone' is technically a transparent variety of Labradorite rather than a true Orthoclase Moonstone. The shimmer is called 'labradorescence' when it flashes multiple colors.

Field identification & locations

Identify in the field by its distinct blue flash when rotated under light and its characteristic cleavage planes. It is commonly found in India, Sri Lanka, Madagascar, and Australia.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Epidote

Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

metamorphic

Nephrite Jade

Nephrite

Mineral/Rock

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Metamorphic Rock

Green Apatite on Albite

Fluorapatite [Ca5(PO4)3F] on Albite [Na(AlSi3O8)]

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Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

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