Where is Moonstone found?
Adularia (Orthoclase Feldspar)
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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
Renowned for producing high-quality blue moonstone, particularly from the Meetiyagoda mines.
India
Known for producing 'rainbow moonstone' (which is actually a variety of labradorite) and peach/gray moonstone.
Myanmar (Burma)
Historically a source of fine moonstone.
Madagascar
Produces various colors of moonstone, including white and peach.
Tanzania
A source of moonstone, often with a good adularescence.
United States (e.g., New Mexico, Virginia)
Localities where feldspar exhibiting adularescence can be found, though often not of gem quality.
Brazil
Produces some moonstone, often in pegmatite deposits.
Collecting tips
- Look for Feldspar Deposits. Moonstone is a feldspar. Search in areas known for pegmatites, hydrothermal veins, or alpine fissures where feldspar minerals are common.
- Observe Optical Effects. The key identifying feature is adularescence. Rotate potential specimens under a light source to look for the characteristic shimmering, bluish-white to silvery sheen.
- Check for Cleavage. Feldspars have distinct cleavage planes. Look for two cleavage directions at or near 90 degrees.
- Consider Associated Minerals. Moonstone can be found alongside other minerals typical of its formation environment, such as quartz, mica, and other feldspars.
Quick Check
- Color:
- White, gray, peach, or colorless body with a blue to white sheen.
- Luster:
- Vitreous to pearly.
- Streak:
- White.
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