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Tsilaisite

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Formula:
Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
System:
Trigonal
Colour:
Greenish yellow
Hardness:
7
Name:
Named after the originally reported locality, Tsilaizina (Madagascar).
Originally described as tsilaisite, but then recognised as only a manganese-rich variety of elbaite, and therefore discredited in 2006. In 2011, a Mn-dominant material from Elba, Italy, was redefined and finally approved as tsilaisite.
The OH analogue of fluor-tsilaisite.

Originally reported from Tsilaizina (Tsilaisina), Sahatany Valley, Vakinankaratra Region, Antananarivo Province, Madagascar.

Classification of Tsilaisite

Redefined Approved 2011
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First Recorded Occurrence of Tsilaisite

Place of Conservation of First Recorded Material:
Museo di Scienze della Terra, settore Mineralogico Pertografico ‘‘Carlo Lorenzo Garavelli’’, Campus Universitario, Bari, Italy,catalogue number 12/nm
Geological Setting of First Recorded Material:
An aplitic dike of a LCT-type pegmatite body
Associated Minerals at First Recorded Locality:

Physical Properties of Tsilaisite

Vitreous
Colour:
Greenish yellow
Streak:
White
Hardness (Mohs):
7
Hardness Data:
Estimated
Tenacity:
Brittle
Fracture:
Sub-Conchoidal
Density:
3.133 g/cm3 (Calculated)

Crystallography of Tsilaisite

Crystal System:
Trigonal
Class (H-M):
3m - Ditrigonal Pyramidal
Space Group:
R3m
Cell Parameters:
a = 15.9461(5) Å, c = 7.1380(3) Å
Ratio:
a:c = 1 : 0.448
Unit Cell Volume:
V 1571.9 ų
Z:
3
X-Ray Powder Diffraction Data:
d-spacingIntensity
6.329 (22)
4.205 (41)
3.974 (100)
3.452 (71)
2.942 (94)
2.570 (79)
2.377 (21)
2.034 (49)

Optical Data of Tsilaisite

Type:
Uniaxial (-)
RI values:
nω = 1.645() nε = 1.625(5)
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Pleochroism:
Visible
Comments:
Pleochroic in plane-polarized light, O = pale greenish yellow, E = very pale greenish yellow

Chemical Properties of Tsilaisite

Formula:
Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
Idealised Formula:
NaMn3Al6(Si6O18)(BO3)3(OH)3OH
Essential elements:
All elements listed in formula:
Analytical Data:
Analysis by a combination of electron microprobe, secondary ion mass spectrometry, and optical absorption spectroscopy
SiO2 (36.10(3))
TiO2 (0.32(4))
Al2O3 (37.10(5))
MnO (9.60(10))
CaO (0.09(4))
Na2O (2.11(7))
K2O  (0.03(1))
F (0.79(3))
B2O3 (10.2(6))
Li2O (0.8(1))
H2O (3.1(2))
sum 99.95 wt%
Empirical Formula:
(Na0.670.30Ca0.02K0.01)Y(Mn2+1.34Al1.14Li0.54Ti0.04)ZAl6T(Si5.94Al0.06)B2.91OV27(OH)3 W(OH0.39F0.41O0.20)

Relationship of Tsilaisite to other Species

Other Members of Group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)
Chromium-draviteNa(Mg3)Cr63+(Si6O18)(BO3)3(OH)3(OH)
Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3O
DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O
DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)
FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)
Fluor-buergeriteNa(Fe33+)Al6(Si6O18)(BO3)3O3F
Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3F
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3F
Fluor-feruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3F
Fluor-schorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3F
Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3F
Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3F
Foitite(□,Na)(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3OH
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)
MaruyamaiteK(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3O
OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)
Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
Oxy-draviteNa(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3O
Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe22+Al)Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3O
PovondraiteNaFe33+(Mg2Fe43+)(Si6O18)(BO3)3(OH)3O
Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)
SchorlNa(Fe32+)Al6(Si6O18)(BO3)3(OH)3(OH)
UM2000-64-SiO:BFeHKMgK, Mg, Fe, Si, B, O, H
Unnamed (Pb-dominant Tourmaline)(Pb,Na)(Li,Al)3Al6(Si6O18)(BO3)3(OH)3(F,OH)
UviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)
Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3O

Other Names for Tsilaisite

Name in Other Languages:
German:Tsilaisit
Simplified Chinese:钠锰电气石
Spanish:Tsilaisita

Other Information

Shows no fluorescence
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Tsilaisite

Reference List:
Nuber, B. and K. Schmetzer (1984), Structural refinement of tsilaisite (manganese tourmaline). Neues Jahrbuch für Mineralogie, Monatshefte, 1984: 301-304.

Am. Min. 70, 877 (1985)

Am. Min. 71, 1214-1216 (1986)

Strunz-Nickel (2001): 611-612.

Can. Min. 44, 1557-1560 (2006)

Bosi, F., Skogby, H., Scandale, E. and Agros, G. (2011): Tsilaisite, IMA 2011-047. CNMNC Newsletter No. 10, October 2011, page 2559.

Bosi, F., Skogby, H., Agrosì, G., Scandale, E. (2012): Tsilaisite, NaMn3Al6(Si6O18)(BO3)3(OH)3OH, a new mineral species of the tourmaline supergroup from Grotta d'Oggi, San Pietro in Campo, island of Elba, Italy. American Mineralogist, 97, 989-994

Internet Links for Tsilaisite

Localities for Tsilaisite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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