gemstone
Moonstone
Orthoclase (KAlSi3O8) or Albite (NaAlSi3O8)
AI-generated identification · may be incorrectMohs hardness 6-6.5, peach to white color, vitreous to pearly luster, monoclinic crystal system, adularescence optical phenomenon.
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Physical properties
Mohs hardness 6-6.5, peach to white color, vitreous to pearly luster, monoclinic crystal system, adularescence optical phenomenon.
Formation & geological history
Forms in igneous and metamorphic rocks as molten rock cools slowly, allowing potassium feldspar and albite to separate into alternating layers.
Uses & applications
Widely used in fine jewelry such as cabochon rings and pendants, and valued by mineral collectors.
Geological facts
Moonstone gets its signature shimmering glow, known as adularescence, from light scattering between microscopic layers of different feldspar minerals.
Field identification & locations
Identify by its characteristic floating sheen and smooth cabochon cut; commonly sourced from India, Sri Lanka, and Madagascar.
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