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Moonstone Information

See also Microcline and the Microcline feldspar variety Amazonite

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Moonstone is a variety of orthoclase feldspar. In the earth's crust, feldspars are more abundant than all other minerals combined. The majority of the common feldspars fall into two groups, the alkali feldspars (KAlSi3O8 through NaAlSi3O8 series), and the plagioclase feldspars (NaAlSi3O8 through CaAl2Si2O8 series). Orthoclase (KAlSi3O8) is the medium temperature pure potassium end member of the alkali feldspar group.

At high temperatures, the alkali feldspars form a continuous solid solution series, however at medium to low crystalization temperatures the sodium feldspar (albite) and potassium feldspar (microcline or orthoclase) separate forming lattice type exsolution intergrowths, usually as thin layers of albite roughly parallel to {100} in a host crystal of microcline or orthoclase. This is known as perthitic texture. Adularia is an unusual gem variety of the potassium feldspar orthoclase. It exhibits an iridescence named adularescence (popularly known as moonstone) which is clearly visible in our samples of moonstone jewelry. This iridescence is due to diffused light reflection from microscopic parallel intergrowths of albite within the orthoclase.

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Moonstone is iridescent orthoclase feldspar. The iridescence in moonstone is due to diffused light reflection from microscopic parallel intergrowths of albite felspar within the orthoclase.

Orthoclase commonly occurs in plutonic igneous rocks such as granites, granodiorites, and syenites that cooled at relatively fast rates and at moderate depth as compared to microcline which forms in more slowly cooled rocks.

Orthoclase is distinguished from the other feldspars by its right angle cleavage and the lack of twin striations on the best cleavage surface. In the field the indicators are its color, hardness, and cleavage. Moonstone is easily recognized by its play of colors.

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The name moonstone comes quite simply from the fact that it can resemble closely the white opaque look of our moon. Feldspar is derived from the German word feld which means field.

Moonstone is a sacred stone in India. It is believed to bring good fortune, and to give protection against the dangers of travel. It is thought to be especially powerful in arousing passion and desire.

Moonstone is used as an ornamental lapidary material.

The astrological sign of moonstone are cancer, Libra, and scorpio.
The astrological sign of amazonite is Virgo.
Amazonite is a alternate birthstone for the month of June.

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Moonstone is said to enhance perception and to alleviate emotional tension while stimulating compusure and confidence, and to improve one's ability to handle difficult situations.

Moonstone is also said to help rejuvenate the body and to calm the mind, bringing a deep sense of happiness. It also is said to enhance fertility and to help with ease of pregnancy and childbirth.

For more in-depth metaphysical information, see our Metaphysical Books section.

This is the end of our Moonstone Factsheet and Information page.

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Last Updated: April 2, 2018
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