Where is Sapphire found?
Corundum (Al₂O₃)
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Open the appSapphire 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 Sapphire
Sri Lanka (Ceylon)
Famous for a wide range of colors, including the highly prized 'cornflower blue' sapphires, as well as star sapphires. Found in alluvial gravels.
Kashmir, India
Historically renowned for its velvety 'cornflower blue' sapphires, though production is now limited. Found in metamorphic rocks.
Myanmar (Burma)
Produces fine blue sapphires, often associated with ruby deposits. Found in metamorphic and alluvial deposits.
Thailand
Known for dark blue and 'parti-colored' sapphires, often heat-treated. Found in basaltic terrains and alluvial deposits.
Australia
A major producer of dark blue and green sapphires, particularly from Queensland and New South Wales. Found in basaltic fields and alluvial deposits.
Madagascar
Significant source of various colors, including fine blue sapphires. Found in metamorphic and alluvial deposits.
Montana, USA
Produces a range of colors, including blue, green, and yellow, often with a metallic sheen. Found in lamprophyre dikes and alluvial deposits (e.g., Yogo Gulch).
East Africa (Tanzania, Kenya)
Various deposits yielding blue, pink, and 'fancy' colored sapphires. Found in metamorphic and alluvial settings.
Collecting tips
- Look in Alluvial Deposits. Many sapphires are found in secondary placer deposits due to their high specific gravity and hardness. Search in riverbeds, ancient stream channels, and gravel pits, especially in regions known for sapphire production. Look for 'heavy minerals' concentrates.
- Identify Associated Minerals. In primary deposits, sapphire can be associated with minerals like spinel, garnet, zircon, rutile, feldspar, mica, and tourmaline. In basaltic environments, look for xenocrysts in volcanic bombs or flows.
- Check for Crystal Habit. Sapphire often forms distinctive hexagonal barrel-shaped or bipyramidal crystals. Even in alluvial deposits, these shapes may be somewhat preserved, though often rounded.
- Test Hardness. Sapphire is extremely hard (Mohs 9). It will scratch almost all other common minerals, including quartz. This is a key diagnostic test, but should be done carefully on a non-gem quality specimen to avoid damage.
- Observe Color and Luster. While blue is classic, be aware of other colors. The vitreous to adamantine luster is also characteristic. Look for color zoning or banding, which is common in natural sapphires.
Quick Check
- Color:
- Blue (most common), but also yellow, pink, green, orange, purple, black, colorless.
- Luster:
- Vitreous to adamantine.
- Streak:
- White.
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