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