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Merelani Hills (Mererani), Lelatema Mts, Simanjiro District, Manyara Region, Tanzania
This page kindly sponsored by Peter Slootweg

Tanzanite
Merelani Hills, Lelatema Mts, Simanjiro District, Manyara Region, Tanzania

Photo: Rob Lavinsky
Latitude: 3°35'0"S
Longitude: 37°0'30"E
 
Name(s) in local language(s): Merelani tanzanite mines (Mererani)
 
The Merelani tanzanite mines or Merelani Gem mining area is a area 2km wide and 50 km long. It's located in the Merelani Hills, on the slope of Lelatema Mountains (which actually are located politically-geographically in the Manyara Region, and not in the Arusha Region), about 70 km southeast of the town of Arusha (located in the Arusha Region), where tanzanite was first found in 1968.
Subdivided in four mining blocks (A, B, C, D) and additional mines.

The occurrence of gem-quality tanzanite and grossular has been found to occur mainly in boudinaged pegmatitic veins and hydrothermal fracture fillings. These fracture fillings occur in brecciated and hydrothermally altered graphite-bearing gneiss in a mineral association containing glass-clear quartz, diopside, zoisite, graphite and calcite.



Mineral List

Mineral list contains entries from the region specified including sub-localities
Alabandite
Allanite-(Ce)
'Apatite'
'Apophyllite'
Axinite-(Mg) (TL)
Axinite-(Mn)
Calcite
'Chabazite'
Chalcopyrite
Clausthalite
Clinochlore
Colusite
Diopside
var: Chromian Diopside
Dravite
Fluorapatite
Fluorite
Germanocolusite
Graphite
Grossular
var: Tsavorite
Gypsum
Hematite
'Heulandite'
Heulandite-Ca
Karelianite
Kyanite
Laumontite
Mesolite
Millerite
Molybdenite
Mukhinite
Muscovite
var: Fuchsite

Phlogopite
Prehnite
Pyrite
Pyrrhotite
Quartz
Rhodochrosite
'Scapolite'
Scolecite
Siderite
Sillimanite
Sphalerite
Stannite
'Stilbite'
Titanite
'Tourmaline'
Tremolite
var: Chrome-Tremolite
Wurtzite
Zircon
Zoisite
var: Tanzanite


73 entries listed. 42 valid minerals. 1 type locality (valid mineral).

Localities in this Region

Tanzania

The above list contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Barot, N.R. and Boehm, E.W. (1992) Gem Quality Green Zoisite, Gems & Gemology: Spring 1992: 28(1).

Tanzanian Journal of Science (2003): 29(2): 55-70.

Canadian Mineralogist (2008): 46: 1183-1194.

Wilson, W.E., Saul, J.M. Pardieu, V. & Hughes R.W. (2009): Famous Mineral Localities. The Merelani Tanzanite Mines, Lelatema Mountains, Arusha Region, Tanzania. Mineralogical Record, 40: 347-408.

Rocks and Minerals (2013): 88(2): 154-165.

Rocks and Minerals (2013): 88(2): 166-173.

Rocks and Minerals (2013): 88(2): 174-177.

Rocks and Minerals (2013): 88(2): 179-183.

Jaszczak, John A. (2014), Mineralogical Miracles at Merelani, presentation to the 41st. Rochester Mineralogical Symposium, April 25, 2014.

C. HARRIS, W. HLONGWANE, N. GULE, and R. SCHEEPERS (2014): ORIGIN OF TANZANITE AND ASSOCIATED GEMSTONE MINERALIZATION AT MERELANI, TANZANIA. South African Journal of Geology, 117, 15-30.

S. Harrison, J. A. Jaszczak, M. Keim, M. Rumsey, and M. A. Wise (2014) "Spectacular Sulfides from the Merelani Tanzanite Deposit, Manyara Region, Tanzania." Mineralogical Record 45:553-570.

External Links


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Copyright © Jolyon Ralph and Ida Chau 1993-2014. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
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