gemstone
Moonstone
Feldspar (Orthoclase or Oligoclase), (K,Na)AlSi3O8
AI-generated identification · may be incorrectHardness of 6 on Mohs scale; white to translucent body color with characteristic blue or white adularescence (schiller); vitreous to pearly luster; monoclinic or triclinic crystal system.
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Physical properties
Hardness of 6 on Mohs scale; white to translucent body color with characteristic blue or white adularescence (schiller); vitreous to pearly luster; monoclinic or triclinic crystal system.
Formation & geological history
Forms when cooling molten rock in igneous environments, particularly pegmatites and granites, as well as in hydrothermal veins.
Uses & applications
Widely cut into cabochons for rings, pendants, and earrings in jewelry making.
Geological facts
The optical phenomenon of adularescence is caused by light scattering between microscopic alternating layers of orthoclase and albite.
Field identification & locations
Identified by its signature floating blue sheen under direct light; commonly sourced from India, Sri Lanka, and Madagascar.
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