Where is Yellow Sapphire found?
Corundum (Al2O3)
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Open the appYellow Sapphire 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 Yellow Sapphire
Sri Lanka (Ceylon)
Renowned for producing high-quality yellow sapphires, often found in alluvial gravels.
Madagascar
Significant producer of various sapphire colors, including yellow, from both primary and secondary deposits.
Australia (Queensland, New South Wales)
Known for producing a range of sapphire colors, including yellow, often from basaltic sources.
Thailand
Historically a major sapphire producer, including yellow varieties, often from basalt-related deposits.
Tanzania
Produces yellow sapphires from various localities, including Tunduru and Umba Valley.
Montana, USA
The Yogo Gulch and Rock Creek areas are known for producing sapphires, including some yellow varieties, from lamprophyre dikes.
Collecting tips
- Alluvial Deposits. Focus on gravel beds of ancient and modern river systems, especially in regions known for sapphire production. Look for heavy mineral concentrations.
- Associated Minerals. In primary deposits, corundum can be found with minerals like spinel, garnet, kyanite, sillimanite, and mica. In placer deposits, look for other heavy minerals like zircon, rutile, and ilmenite.
- Hardness Test (Caution). Due to its extreme hardness (9 on Mohs scale), sapphire can scratch most other common minerals. This can be a distinguishing feature, but care must be taken not to damage other specimens. This test is generally not recommended for valuable specimens.
- Specific Gravity. Sapphire has a relatively high specific gravity (3.95-4.10), meaning it will feel noticeably heavy for its size compared to many other minerals. This property aids in its concentration in placer deposits.
Quick Check
- Color:
- Yellow to golden yellow
- Luster:
- Vitreous to adamantine
- Streak:
- White (corundum is harder than the streak plate)
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