mineral
Moonstone (with Tourmaline/Mica)
Orthoclase/Albite Feldspar (KAlSi3O8 / NaAlSi3O8)
Hardness: 6-6.5 Mohs. Color: Blueish-white translucent body with black inclusions. Luster: Vitreous to pearly. Structure: Monoclinic/Triclinic. Cleavage: Perfect in two directions.
- Hardness
- 6-6
- Color
- Blueish-white translucent body with black inclusions
- Luster
- Vitreous to pearly
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Physical properties
Hardness: 6-6.5 Mohs. Color: Blueish-white translucent body with black inclusions. Luster: Vitreous to pearly. Structure: Monoclinic/Triclinic. Cleavage: Perfect in two directions.
Formation & geological history
Formed in igneous and metamorphic rocks, specifically pegmatites. The blue sheen (adularescence) occurs from the intergrowth of orthoclase and albite as the magma cools.
Uses & applications
Primarily used as a gemstone in jewelry (cabochons, beads) and as a healing crystal in metaphysical practices.
Geological facts
This specimen appears to be 'Rainbow Moonstone' (a variety of labradorite) or white orthoclase with black tourmaline (Schorl) or biotite mica inclusions. The blue tint seen in the highlights is characteristic of adularescence.
Field identification & locations
Identify by its characteristic 'glow' or sheen when rotated under light. Commonly found in India, Sri Lanka, and Madagascar. Collectors look for high transparency and vibrant blue flash.
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