mineral
Rainbow Moonstone
White Labradorite (Plagioclase Feldspar), (Na,Ca)(Al,Si)4O8
Hardness: 6-6.5 Mohs. Color: White or transparent with black inclusions and blue/multicolored adularescence. Luster: Vitreous to pearly. Crystal Structure: Triclinic. Specific gravity: 2.54-2.63.
- Hardness
- 6-6
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs. Color: White or transparent with black inclusions and blue/multicolored adularescence. Luster: Vitreous to pearly. Crystal Structure: Triclinic. Specific gravity: 2.54-2.63.
Formation & geological history
Formed in igneous and metamorphic rocks. Most specimens are white labradorite that cooled slowly, allowing internal layers to separate and cause the characteristic blue 'sheen' or adularescence. Commonly found in Madagascar, India, and Sri Lanka.
Uses & applications
Widely used as a gemstone in rings, pendants, and bracelets. High-quality pieces are popular for mineral collectors and metaphysical jewelry.
Geological facts
Despite its trade name 'Rainbow Moonstone', it is technically a variety of labradorite rather than true orthoclase moonstone. The iridescent blue sheen is caused by light interference within the microscopic layers of the stone.
Field identification & locations
Identify by looking for a characteristic blue or multi-colored internal flash when rotated under light. Often contains black tourmaline (schorl) or biotite inclusions. Look for two directions of cleavage at nearly 90 degrees.
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