mineral
Rainbow Moonstone
White Labradorite (formula: (Na,Ca)(Al,Si)4O8)
AI-generated identification · may be incorrectHardness: 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
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Physical properties
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
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.
