Lake Manyara, Arusha Region, Tanzania

The Lake Manyara deposit is on the western shore of Lake Manyara, 35 km NE of Mbulu settlement. Emerald and alexandrite were mined in relatively small quantities from the biotite schist at the contact with pegmatites. They occur with apatite, yellow chrysoberyl, pyrope-almandine garnet, spinel, olivine, clinopyroxene, chondrodite, corundum, phenakite, tourmaline, light-coloured beryl, and other minerals.

The emerald crystals are characterized by inclusions of mica, apatite and quartz, as well as gas-liquid inclusions in the form of negative crystals and fan-shaped healed fractures. RI of emerald is 1.576 - 1.590, density is 2.69 - 2.75 g/cm³.

Ref: E.Ya.Kievlenko, Geology of gems, 2003, p. 86

Gemstone List

Gem list contains entries from all listed localities in region.


Localities in this Region

Tanzania
Copyright © Jolyon & Katya Ralph 1993-2018. Site Map. Locality, gem & photograph data are the copyright of the individuals who submitted them. For more information please contact the . Gemdat.org is an online information resource dedicated to providing free gemmological information to all.