mineral

Moonstone (specifically Rainbow Moonstone / White Labradorite)

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

Hardness: 6–6.5 (Mohs scale); Color: White with grey/black inclusions (biotite/tourmaline) and blue 'adularescence' flashes; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Two directions at nearly 90 degrees; Specific gravity: 2.6 – 2.7.

Hardness: 6–6
Luster: Vitreous to pearly

Identified April 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in igneous environments (plutonic rocks like pegmatites) and metamorphic rocks. The characteristic 'glow' results from the intergrowth of two types of feldspar that separate as the mineral cools.

Uses & applications

Predominantly used as a gemstone in jewelry (rings, pendants, earrings), and as a metaphysical or collector's specimen.

Geological facts

Despite the name, 'Rainbow Moonstone' is technically a variety of Labradorite rather than True Moonstone (Orthoclase). Legend has it that moonstones are made of solidified moonbeams.

Field identification & locations

Identify in the field by its pearly luster, typical feldspar cleavage planes, and the 'shiller' or blue flash effect when rotated under light. Often found in India, Sri Lanka, Madagascar, and Canada.

Other mineral specimens

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Sandstone (with potential mineral staining/concretions)

Arenite (SiO2 based)

sedimentary

Schist

Metamorphic

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)]

mineral