Chemistry:Tsilaisite
From HandWiki
| Tsilaisite | |
|---|---|
| General | |
| Category | Tourmaline |
| Formula (repeating unit) | NaMn2+3Al6Si6O18(BO3)3(OH)3OH |
| Crystal system | Trigonal |
| Identification | |
| Mohs scale hardness | 7 to 7.5 |
| |re|er}} | Vitreous |
| Streak | White |
Tsilaisite is a manganese rich variety of elbaite tourmaline.[2] It is also known as Tsilaizite.[3] Tsilaisite is related Fluor-tsilaisite.[4] The gem is named after the location it was first found.[5]
History
It was first reported in the Tsilaisina (also called Tsilaizina) Mine in Vakinankaratra, Madagascar .[3]
The gem was originally described as tsilaisite. But then it was discredited in 2006. In 2011 it was reapproved as tsilaisite.[5]
Characteristics
Color
In plane polarized light, the gem is pleochroic.[6] Tsilaisite can be deep pink, red,[2] orangish-yellow, brownish-gold,[3] or greenish-yellow.[5]
Chemistry
Manganese makes up to 3% of the gem's chemistry.[3]
References
- ↑ Warr, L.N. (2021). "IMA–CNMNC approved mineral symbols". Mineralogical Magazine 85 (3): 291–320. doi:10.1180/mgm.2021.43. Bibcode: 2021MinM...85..291W.
- ↑ 2.0 2.1 Manutchehr-Danai, Mohsen (2013-03-09) (in en). Dictionary of Gems and Gemology. Springer Science & Business Media. pp. 485. ISBN 978-3-662-04288-5. https://books.google.com/books?id=2UX1CAAAQBAJ.
- ↑ 3.0 3.1 3.2 3.3 "Tsilaisite" (in en-US). 2017-03-27. https://nationalgemlab.in/tsilaisite/.
- ↑ 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. https://www.cambridge.org/core/journals/mineralogical-magazine/article/abs/fluortsilaisite-namn3al6si6o18bo33oh3f-a-new-tourmaline-from-san-piero-in-campo-elba-italy-and-new-data-on-tsilaisitic-tourmaline-from-the-holotype-specimen-locality/01BE7B7D01B2B491E4A512C9E83D4CC0.
- ↑ 5.0 5.1 5.2 "Tsilaisite". https://www.mindat.org/min-8016.html.
- ↑ (in en) Issues in Geology and Mineralogy: 2013 Edition. ScholarlyEditions. 2013-05-01. pp. 677. ISBN 978-1-4901-0698-4. https://books.google.com/books?id=u6s6aRTPoU4C&dq=Tsilaisite&pg=PA677.
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