Moonstone

Main Deposits

Sri Lanka (finest blue specimens), India, Myanmar, Madagascar, and Tanzania

Description and Characteristics

Moonstone is a variety of orthoclase (potassium feldspar) that exhibits a unique optical phenomenon called adularescence. This effect consists of a bluish or whitish glow that seems to float just below the surface of the stone when moved. It is formed by the presence of alternating layers of orthoclase and albite that diffract light. It is a translucent gem that, although it can appear in various colors, is most valued the more transparent it is and the bluer its glow. It has been used in jewelry since classical civilizations, reaching its peak during the Art Nouveau period.

Chemical Formula	$$(K,Na)AlSi₃O₈$$
Luster	Vitreous to pearly
Streak	White
Fracture	Conchoidal to uneven
Cleavage	Perfect in two directions
Hardness	6-6,5 Mohs
Crystal System	Monoclinic

Did you know...?

In ancient Rome, it was believed that moonstone was formed from droplets of solidified moonlight. An important fact for buyers: what is often sold as "Rainbow Moonstone" is technically a variety of White Labradorite, not authentic moonstone (orthoclase). To maintain its luster, contact with chemicals should be avoided, and it should be cleaned only with warm water and mild soap. Having perfect cleavage, it is a stone sensitive to sharp blows, so it is recommended to protect it well in rings and bracelets.

New-Age Properties

Moonstone is the stone of "new beginnings" and is deeply linked to feminine energy and the Moon. It is a stone of introspection that helps balance hormonal and emotional cycles. Spiritually, it enhances intuition and psychic abilities, making it ideal for meditation and dream work. Mentally, it calms overreactions to stressful situations and helps distinguish between reality and illusion. It is a perfect companion for those traveling by sea or at night, and it is said to bring luck in matters of the heart.