mineral
Rainbow Moonstone (White Labradorite)
Labradorite (Feldspar family, (Na,Ca)(Al,Si)4O8)
Hardness: 6-6.5 (Mohs scale), Color: White to colorless with blue/multicolor schiller (adularescence), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions.
- Hardness
- 6-6
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Physical properties
Hardness: 6-6.5 (Mohs scale), Color: White to colorless with blue/multicolor schiller (adularescence), Luster: Vitreous to pearly, Crystal structure: Triclinic, Cleavage: Perfect in two directions.
Formation & geological history
Formed in both igneous and metamorphic rocks. Most 'Rainbow Moonstone' is technically a translucent white variety of labradorite feldspar rather than true orthoclase moonstone. It forms through the slow cooling of magma which creates alternating microscopic layers of different feldspars.
Uses & applications
Primarily used in jewelry (cabochons, beads, rings), ornamental carvings, and by collectors for its aesthetic schiller effect. It is also significant in metaphysical and spiritual practices.
Geological facts
Despite the trade name 'Moonstone,' most specimens that show multi-colored flashes (like this piece) are actually White Labradorite. True Moonstone belongs to the orthoclase/adularia group and typically only shows a white or blue sheen.
Field identification & locations
Identify by looking for 'adularescence'—a glow or flash of color that moves as you rotate the stone. Found commonly in Madagascar, India, Sri Lanka, and Canada. In the field, look for characteristic feldspar cleavage planes.
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