Where is Moonstone found?
Adularia or Orthoclase (feldspar group)
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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
Historically the primary source of the finest blue moonstones, particularly from the Meetiyagoda mines.
India
Produces a significant amount of moonstone, often with a more milky or creamy body color and a less intense blue flash, sometimes exhibiting a rainbow effect.
Myanmar (Burma)
Known for producing high-quality moonstone, often with a good blue sheen.
Madagascar
A source of various colors of moonstone, including white, gray, and peach.
Brazil
Produces moonstone, though often not of the same gem quality as Sri Lankan material.
Tanzania
Another source of moonstone, contributing to the global supply.
United States (e.g., New Mexico, Virginia, Pennsylvania)
Minor occurrences of moonstone have been found in various states, though not typically of commercial gem quality.
Collecting tips
- Look for Feldspar-Rich Environments. Moonstone is a variety of feldspar, so search in areas known for pegmatites, granites, and other igneous or metamorphic rocks rich in feldspar minerals.
- Examine Hydrothermal Veins. Adularia, a low-temperature variety of orthoclase that can exhibit adularescence, often forms in hydrothermal veins, so these are good places to investigate.
- Check Alluvial Deposits. Due to its durability, moonstone can be found in riverbeds and gravel deposits downstream from its primary source. Look for rounded, water-worn pebbles.
- Observe for Adularescence. The key identifying feature is the characteristic schiller or 'moon-like' glow. Rotate potential specimens under a light source to check for this optical effect.
- Consider Associated Minerals. Moonstone can be found alongside other minerals common in pegmatites and granites, such as quartz, mica, and other feldspars.
Quick Check
- Color:
- Colorless to white, gray, peach, pink, green, or brown, with a characteristic blue or white sheen (adularescence).
- Luster:
- Vitreous to pearly.
- Streak:
- White.
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