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.

Axinite
var: Magnesio-axinite
Axinite-(Mg)
Beryl
var: Emerald
Chrysoberyl
var: Alexandrite
Clinohumite
Cordierite
Corundum
var: Ruby
var: Sapphire
var: Star Ruby
Danburite
Diamond
Diopside
Enstatite
Euclase
Feldspar
var: Labradorite
var: Oligoclase
Garnet Group
var: Almandine-Pyrope
var: Grossular
var: Hessonite
var: Malaia Garnet
var: Pyrope-Spessartine
var: Rhodolite
var: Spessartine
var: Tsavorite
Kornerupine
Kyanite
Opal
var: Prase Opal
Quartz
var: Amethyst
var: Chrysoprase
var: Citrine
Scapolite
Serpentine
Sillimanite
Sodalite
Spinel
Taaffeite
var: Musgravite
Tourmaline
var: Chrome-Tourmaline
var: Dravite
Vesuvianite
Zircon
Zoisite
var: Anyolite
var: Tanzanite
var: Thulite

Gemstones from Tanzania by Colour

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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
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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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