mineral
Rainbow Moonstone
White Labradorite (var. of Anorthite), (Ca,Na)(Al,Si)4O8
Hardness: 6-6.5 (Mohs scale); Color: White or colorless with blue or multicolored adularescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions
- Hardness
- 6-6
- Color
- White or colorless with blue or multicolored adularescence
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 (Mohs scale); Color: White or colorless with blue or multicolored adularescence; Luster: Vitreous to pearly; Crystal structure: Triclinic; Cleavage: Perfect in two directions
Formation & geological history
Rainbow Moonstone is actually a variety of labradorite feldspar that forms in igneous environments, typically within pegmatites or metamorphic rocks under specific pressure and temperature conditions that allow for thin micro-lamellar structures.
Uses & applications
Primarily used as a gemstone in jewelry (rings, pendants, earrings), and as a popular specimen for metaphysical collectors and mineral enthusiasts.
Geological facts
Despite its trade name, Rainbow Moonstone is technically a variety of Labradorite rather than True Moonstone (which is orthoclase). The shimmery play of light is called labradorescence or adularescence, caused by light scattering between layers of different feldspar compositions.
Field identification & locations
Identify by its characteristic blue or rainbow 'flash' when tilted in the light. It is commonly found in India, Madagascar, Sri Lanka, and Australia. Collectors should look for high transparency and strong color flash.
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