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Tsarstone collectors guide

Brazilian alexandrite

Alexandrite is rare and usually low quality, although in the past few years some very excellent specimens of alexandrite from the Carnaiba mine appeared on the market. One pegmatite near Jaqueto yielded a 120,000 carat twinned crystal.

Locality details
RegionNortheast Region
LocalityCarnaiba mine
Time zoneUTC -3 (-2DT)
Locality maps
Map of Carnaiba Satellite of Carnaiba

In the region surrounding the Carnaiba deposit, Middle Proterozoic quartzites, phyllites, and quartz-chlorite schists are intruded by granite. Within this succession are tabular serpentinites and serpentine-talc schists covering an area of 10 to 15 km by 200 m that are surrounded by granite. Emerald occurs in the serpentinites adjacent to granite and also within a large xenolith in granite. Oligioclase-beryl-muscovite pegmatite and quartz veins with beryl, apatite, tourmaline and sulfides also are found within the ultramafics and less often within quartzite.

Biotite-phlogopite-schist and phlogopite-talc-schist which contain emerald and alexandrite lie near veins in tectonic zones within the ultramafics. The emeralds have Cr2O3 contents up to 0.73% and are disseminated in glimmerites and generally are 2 to 3 cm (0.8 to 1.2 in) in length. Some of the emeralds are high quality but mixed with considerable amounts of low-quality material.

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Bibliographic details
Page title Brazilian alexandrite, Carnaiba Mine
Author David Weinberg
Website title Alexandrite Tsarstone Collectors Guide
Date published 03 July 2010 05:11 UTC
Date accessed 27 May 2018 16:44 UTC
Permanent link
AMA style
David Weinberg. "Brazilian alexandrite, Carnaiba Mine". In Alexandrite Tsarstone Collectors Guide. July 03, 2010, 05:11 UTC. Available at: Accessed May 27, 2018.
APA style
"Brazilian alexandrite, Carnaiba Mine". (2010, July 03). In Alexandrite Tsarstone Collectors Guide. Retrieved 16:44, May 27, 2018, from
Bluebook style
"Brazilian alexandrite, Carnaiba Mine", (last visited May 27, 2018).
Bluebook: Harvard JOLT style
See Alexandrite Tsarstone Collectors Guide, "Brazilian alexandrite, Carnaiba Mine", (Information about Brazilian alexandrite findings and mining in Pindobacu, Brazil) (as of May. 27, 2018, 16:44 GMT).
CBE/CSE style
David Weinberg. "Brazilian alexandrite, Carnaiba Mine". In Alexandrite Tsarstone Collectors Guide. 2010 Jul 03, 05:11 UTC.[Internet], Alexandrite Tsarstone Collectors Guide; 2010 Jul 03, 05:11 UTC [cited 2018 May 27]. Available from:
Chicago style
David Weinberg, "Brazilian alexandrite, Carnaiba Mine",, (accessed May 27, 2018).
MLA style
"Brazilian alexandrite, Carnaiba Mine". Alexandrite Tsarstone Collectors Guide. 03 Jul 2010, 05:11 UTC. 27 May 2018
MHRA style
David Weinberg, "Brazilian alexandrite, Carnaiba Mine", Alexandrite Tsarstone Collectors Guide, 03 July 2010, 05:11 UTC, [accessed 27 May 2018].
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