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Alexandrite

Tsarstone collectors guide

Tanzanian alexandrite

Best-known for it's emeralds, the deposit is in Mayoka Village at the southern tip of Lake Manyara, regularly producing high quality alexandrite, but most of the stones appear to be khaki or yellowish-green in daylight, moving to brownish-red under incandescent light.

Locality details
CountryTanzania
RegionArusha Region
ProvinceArusha
LocalityLake Manyara
Latitude-11.0667
Longitude37.3500
Altitude1998
Time zoneUTC+3
Locality maps
MapSatellite
Map of Lake Manyara Satellite of Lake Manyara

The far-flung emerald deposit near Mayoka Village, the deposit is at the southern tip of Lake Manyara reported small pieces of mother rock in contact zones between biotite-actinolite schists/gneisses and pegmatites, on which, associated with feldspar and mica, alexandrite, emerald and ruby occur. Production statistics indicate that over one thousand carats of alexandrite have been mined, but no official alexandrite reserve exists. It is believed that the western sides of Lake Manyara host some alexandrite deposits. Recent discoveries of alexandrite and cat's eye are being worked by small-scale and artisanal miners in the beds of the Muhuwesi, Mtetesi, Lumesule and Nambalapi Rivers.


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