Where is Moonstone found?
Adularia (Orthoclase variety) or Albite (Plagioclase Feldspar variety)
Got a photo? Identify rocks instantly with the Rockby app
Open the appMoonstone occurs in specific geological environments. Knowing where to look, and in what kind of rock, is the difference between going home empty-handed and finding a great specimen.
Where to find Moonstone
Sri Lanka
Historically the most important source, producing high-quality blue moonstone.
India
Known for producing 'rainbow moonstone' (which is actually a variety of labradorite) and other moonstone varieties.
Myanmar (Burma)
Produces fine quality moonstone.
Madagascar
A source of various feldspar minerals, including moonstone.
Tanzania
Known for some moonstone occurrences.
Brazil
Produces some moonstone.
United States (e.g., New Mexico, Virginia)
Minor occurrences of moonstone have been found.
Collecting tips
- Look for Feldspar Deposits. Moonstone is a feldspar, so search in areas known for pegmatites, syenites, or other feldspar-rich igneous and metamorphic rocks.
- Identify Adularescence. The most distinctive feature is the adularescence. Rotate potential specimens under a light source to observe the characteristic shimmering effect. This effect is best seen on polished or fractured surfaces.
- Check for Cleavage. Feldspars have distinct cleavage planes. Look for two perfect cleavages intersecting at or near 90 degrees.
- Consider Luster. Moonstone typically has a vitreous to pearly luster.
- Examine Transparency. Gem-quality moonstone is usually translucent to semi-transparent, allowing light to pass through and interact with the internal structure.
Quick Check
- Color:
- Colorless to white, with a characteristic blue, silver, or white sheen (adularescence).
- Luster:
- Vitreous to pearly.
- Streak:
- White.
Explore Moonstone
Identify rocks anywhere
Free on iOS, Android, and Web. Photo identification, full database, and your personal collection.