Tanzania

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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

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Localities in this Region

Tanzania

Arusha Region
- Dumbawanga District
  - Manghola
- Lake Manyara
  - Magara mine
- Longido
  - Muriatata hills
    - Ruby occurrence
- Mundarara Mine (Mdarara)
- Ngorongoro district
  - Loliondo
    - Nani Hill
Dodoma Region
- Haneti-Itiso area
- Mpwapwa District (Mpwampwa)
  - Mpapwa
    - Rubeho Mtn
    - Winza
Manyara Region
- Simanjiro District
  - Landanai (Landenai)
  - Lelatema Mts
    - Merelani Hills (Mererani)

Tanzania

Manyara Region
- Simanjiro District
  - Lelatema Mts
    - Merelani Hills (Mererani)
      - Mawaya pit
      - Samax Mine
Morogoro Region
- Kilosa District
  - Gairo
- Mahenge
- Uluguru Mts (Uruguru Mts)
  - Morogoro
    - Marble occurrence
Rukwa Region
- Sumbawanga District
  - Kalambazite
Ruvuma Region
- Mbinga District
  - Amanimakoro
- Songea Urban District
  - Songea
- Tunduru District
  - Tunduru
Shinyanga Region
- Mwadui
  - Williamson Mine (Mwadui mine; Mwaudi kimberlite pipe; Wilsons pipe)
Tanga Region
- Umba River (Umba Valley)
  - Gerevi Hills

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