Crystal Encyclopedia

Choose a letter, pick a stone from the list, and read about it: what it is made of, how hard it is, what it looks like, what it has traditionally been said to do, and how to look after it.

450 minerals

Moonstone (Gemstone)

The Moonlit Glow of the Inner Tides

Also known as: Adularia

About the stone

Moonstone (Gemstone) crystal
Photo: Wouter Hagens, Public domain, via Wikimedia Commons

Moonstone is a feldspar gemstone prized for adularescence—a floating, moonlike glow produced when light scatters between microscopic mineral layers. Known for centuries, it has no single documented discoverer or discovery date; Switzerland’s St. Gotthard region was an early source of fine material, and designers such as René Lalique and Louis Comfort Tiffany later popularized it in Art Nouveau jewelry. Important sources include Sri Lanka, India, Madagascar, and Tanzania. Historically called “adularia,” it is also sold under descriptive names such as “blue moonstone”; “rainbow moonstone,” however, is usually a different feldspar, labradorite, rather than traditional orthoclase moonstone. In Hindu mythology it consists of solidified moonbeams, while other legends associate it with good fortune and foretelling the future.

Mineral data

  • Chemical composition: Moonstone is a feldspar gemstone made of thin alternating layers of orthoclase (KAlSi3O8) and albite (NaAlSi3O8), whose different refractive indexes scatter light to produce a soft glow called adularescence.
  • Hardness: 6 to 6.5 on the Mohs scale.
  • Color: Usually white or silvery with a soft blue-white glow; the body color can also be black, gray, brown, pink, salmon, orange, green, yellow or clear.
  • Specific gravity: 2.61
  • Refractive index: 1.518-1.526

Metaphysical data

Moonstone, recognized for the soft glow that floats just beneath its surface like the moon behind cloud, has been used in metaphysical practices to encourage intuition, emotional balance and a gentle connection to natural cycles.

Calming and Cycle Energy

  • Moonstone is believed to carry the calm of moonlight, helping one feel in tune with natural rhythms and settle into the slow turning of days and seasons.
  • Its soft glow is thought to soothe a restless mind, offering a quiet moment of balance when emotions rise and fall like the tides.

Emotional Healing

  • This stone is traditionally said to ease emotional tension, helping the heart feel cradled and supported during times of change or uncertainty.
  • It is often used to encourage gentle self-understanding, making space for sensitive feelings to be seen without judgment.

Harmonizing Energy Centers

  • Moonstone is commonly connected with the third eye and crown chakras, thought to support intuition and a clear, gentle inner sight.
  • Many also link it with the sacral chakra, the center of feeling and flow, using it to encourage emotional ease.

Zodiac Associations

  • Moonstone is not strongly tied to one zodiac sign, though it is often connected with Cancer, the sign ruled by the moon, and with Libra and Scorpio.
  • Anyone who feels drawn to the moon, its phases and its quiet influence may find it a fitting companion, whatever their birth chart.

Spiritual Growth

  • Moonstone is believed to support intuition and dreamwork, and many people keep it near the bed or on a nighttime altar to encourage reflective sleep.
  • It is often used in new-moon and full-moon rituals, setting intentions during the waxing moon and releasing what is finished during the waning.

Physical Healing

  • Moonstone is not a substitute for professional medical advice; some traditions link it with the body's natural cycles and a sense of calm during times of change.
  • It is thought to encourage rest and gentle self-care, but any physical concern should be taken to a qualified professional.

Care and handling

Moonstone is softer than quartz and has perfect cleavage, so it can crack or chip easily, and many common objects can scratch it. Protect it from knocks, store it separately from harder stones and remove jewelry before heavy work. Clean with lukewarm water, mild soap and a soft cloth, then dry it. Avoid ultrasonic cleaners, steam, sudden temperature changes and harsh chemicals.

Individual experiences with Moonstone vary, and its effects are personal and not guaranteed. Use it with mindful intention, and let its soft glow invite you to move gently with your own inner tides.