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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
RegionArusha Region
LocalityLake Manyara
Time zoneUTC+3
Locality maps
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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Bibliographic details
Page title Tanzanian alexandrite, Lake Manyara
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:13 UTC
Date accessed 23 May 2018 14:10 UTC
Permanent link
AMA style
David Weinberg. "Tanzanian alexandrite, Lake Manyara". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:13 UTC. Available at: Accessed May 23, 2018.
APA style
"Tanzanian alexandrite, Lake Manyara". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 14:10, May 23, 2018, from
Bluebook style
"Tanzanian alexandrite, Lake Manyara", (last visited May 23, 2018).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Tanzanian alexandrite, Lake Manyara", (Information about Tanzanian alexandrite findings and mining in Lake Manyara, Tanzania.) (as of May. 23, 2018, 14:10 GMT).
CBE/CSE style
David Weinberg. "Tanzanian alexandrite, Lake Manyara". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:13 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:13 UTC [cited 2018 May 23]. Available from:
Chicago style
David Weinberg, "Tanzanian alexandrite, Lake Manyara",, (accessed May 23, 2018).
MLA style
"Tanzanian alexandrite, Lake Manyara". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:13 UTC. 23 May 2018
MHRA style
David Weinberg, "Tanzanian alexandrite, Lake Manyara", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:13 UTC, [accessed 23 May 2018].
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