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Tsilaisite

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Tsilaisite
General
CategoryTourmaline
Formula
(repeating unit)		NaMn3Al6Si6O18(BO3)3(OH)3OH
IMA symbolTsl
Crystal systemTrigonal
Identification
Mohs scale hardness7 to 7.5
LusterVitreous
StreakWhite

Tsilaisite is a manganese rich variety of elbaite tourmaline. It is also known as Tsilaizite. Tsilaisite is related Fluor-tsilaisite. The gem is named after the location it was first found.

History

It was first reported in the Tsilaisina (also called Tsilaizina) Mine in Vakinankaratra, Madagascar.

The gem was originally described as tsilaisite. But then it was discredited in 2006. In 2011 it was reapproved as tsilaisite.

Characteristics

Color

In plane polarized light, the gem is pleochroic. Tsilaisite can be deep pink, red, orangish-yellow, brownish-gold, or greenish-yellow.

Chemistry

Manganese makes up to 3% of the gem's chemistry.

References

  1. Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine. 85 (3): 291–320. Bibcode:2021MinM...85..291W. doi:10.1180/mgm.2021.43. S2CID 235729616.
  2. ^ Manutchehr-Danai, Mohsen (2013-03-09). Dictionary of Gems and Gemology. Springer Science & Business Media. p. 485. ISBN 978-3-662-04288-5.
  3. ^ "Tsilaisite". National Gem Lab. 2017-03-27. Retrieved 2021-09-27.
  4. Bosi, Ferdinando; Andreozzi, Giovanni B.; Agrosi, Giovanna; Scandale, Eugenio (February 2015). "Fluor-tsilaisite, NaMn3Al6(Si6O18)(BO3)3(OH)3F, a new tourmaline from San Piero in Campo (Elba, Italy) and new data on tsilaisitic tourmaline from the holotype specimen locality". Mineralogical Magazine. 79 (1): 89–101. doi:10.1180/minmag.2015.079.1.08. ISSN 0026-461X. S2CID 129149776.
  5. ^ "Tsilaisite". www.mindat.org. Retrieved 2021-09-27.
  6. Issues in Geology and Mineralogy: 2013 Edition. ScholarlyEditions. 2013-05-01. p. 677. ISBN 978-1-4901-0698-4.


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