Moonstone

The Moonstone is a variety of orthose being a part of the family of feldspars. His optical effects are the adularescence *, the chatoyance *, the asterism *, aventurescence* and opalescence* (*: see glossary).

Color: colorless, creamy white, grey in silvery, beige in dark brown, light yellow in clear, yellow-orange-colored in orange, brown-orangy color in Orange brownish, salmon pink, Orange reddish, green (rare).
Hardness: 6 - 6,5
Refractive index: 1,517 - 1,54
Density: 2,55 - 2,67
Chemical composition: K, Na [ AlSi3O8] (Aluminosilicate of potassium and/or sodium)
Crystalline structure: monoclinic ( orthose ) and/or triclinic (albite, oligoclase)
Luster: glassy, pearly on the cleavage.
Origin: Sri Lanka, India, Myanmar, Africa: Tanzania, Madagascar, etc.

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