Tanzania

Ruby and sapphire deposits of the anorthosite type are known in the Umba River Valley and in the region of Longido in northern Tanzania, near the Kenyan border. They are bodies of metamorphosed ultramafic rocks, which are part of the older Precambrian Usagaran group of granite gneisses, crystalline schists, quartzites, and dolomites within the Mozambique foldbelt.

Ref: E.Ya. Kievlenko, Geology of gems, 2003, p. 59

Gemstone List

Gem list contains entries from all listed localities in region.

Gemstones from Tanzania by Colour

Click on a photo for more information.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Localities in this Region

Tanzania
Tanzania
  • Manyara Region
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    • Simanjiro District
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      • Lelatema Mountains
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        • Merelani Hills (Mererani)
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  • Morogoro Region
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  • Morogoro Region
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    • Kilosa District
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Mahenge
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  • Morogoro Region
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    • Uluguru Mts (Uruguru Mts)
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      • Morogoro
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  • Rukwa Region
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    • Sumbawanga District
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  • Ruvuma Region
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    • Mbinga District
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  • Ruvuma Region
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    • Songea Urban District
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  • Ruvuma Region
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    • Tunduru District
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  • Shinyanga Region
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  • Tanga Region
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    • Korogwe Rural District
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  • Tanga Region
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    • Korogwe Rural District
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      • Umba River (Umba Valley)
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