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Tsilaisite

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Formula:
Na(Mn
2+
 
)
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
System:TrigonalColour:Greenish yellow
Hardness:7
Member of:Tourmaline Group
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

IMA status:Redefined Approved 2011
mindat.org URL:http://www.mindat.org/min-8016.html
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Type Occurrence of Tsilaisite

Type Locality:Grotta d'Oggi Quarry, San Piero in Campo, Campo nell'Elba, Elba Island, Livorno Province, Tuscany, Italy
Place of Conservation of Type Material:Museo di Scienze della Terra, settore Mineralogico Pertografico ‘‘Carlo Lorenzo Garavelli’’, Campus Universitario, Bari, Italy,catalogue number 12/nm
Geological Setting of type material:An aplitic dike of a LCT-type pegmatite body
Associated Minerals at type locality:
SchorlQuartzK FeldsparElbaiteAlbite-Anorthite Series

Physical Properties of Tsilaisite

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

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:
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)
Maximum Birefringence:δ = 0.020

Chart 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(Mn
2+
 
)
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Simplified for copy/paste:Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
Idealised Formula:
NaMn
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
OH
Essential elements:Al, B, H, Mn, Na, O, Si
All elements listed in formula:Al, B, H, Mn, Na, O, Si
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:
(Na
 
0.67
 
0.30
Ca
 
0.02
K
 
0.01
)
Y
 
(Mn
2+
1.34
Al
 
1.14
Li
 
0.54
Ti
 
0.04
)
Z
 
Al
T
6
(Si
 
5.94
Al
 
0.06
)B
 
2.91
O
V
27
(OH)
 
3
W
 
(OH
 
0.39
F
 
0.41
O
 
0.20
)

Relationship of Tsilaisite to other Species

Member of:Tourmaline Group
Other Members of Group:

- +
Adachiite
Chromium-dravite
Na(Mg
 
3
)Cr
3+
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Chromo-alumino-povondraite
Na(Cr
 
3
)(Al
 
4
Mg
 
2
)(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Darrellhenryite
Na(LiAl
 
2
)Al
 
6
(BO
 
3
)
 
3
Si
 
6
O
 
18
(OH)
 
3
O
Dravite
Na(Mg
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Elbaite
Na(Li
 
1.5
Al
 
1.5
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Feruvite
Ca(Fe
2+
 
)
 
3
MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Fluor-buergerite
Na(Fe
3+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
O
 
3
F
Fluor-dravite
Na(Mg
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-elbaite
Na(Li
 
1.5
Al
 
1.5
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-feruvite
Ca(Fe
2+
 
)
 
3
MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-liddicoatite
Ca(Li
 
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-schorl
Na(Fe
2+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-tsilaisite
Na(Mn
2+
 
)
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Fluor-uvite
Ca(Mg
 
3
)MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
F
Foitite
(□,Na)(Fe
2+
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
OH
Liddicoatite
Ca(Li
 
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Luinaite-(OH)
Na(Fe
2+
 
)
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Magnesiofoitite
(□,Na)(Mg
 
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Olenite
Na(Al
 
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
O
 
3
(OH)
Oxy-chromium-dravite
Na(Cr)
 
3
(Cr
 
4
Mg
 
2
)(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Oxy-dravite
Na(MgAl
 
2
)MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Oxy-rossmanite
☐(LiAl
 
2
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Oxy-schorl
Na(Fe
2+
2
Al)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Oxy-vanadium-dravite
Na(V)
 
3
(V
 
4
Mg
 
2
)Si
 
6
O
 
18
(BO
 
3
)
 
3
(OH)
 
3
O
Povondraite
NaFe
3+
3
(Mg
 
2
Fe
3+
4
)(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Rossmanite
☐(LiAl
 
2
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
Schorl
Na(Fe
2+
3
)Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(OH)
UM2000-64-SiO:BFeHKMg
K, Mg, Fe, Si, B, O, H
Unnamed (Pb-dominant Tourmaline)
(Pb,Na)(Li,Al)
 
3
Al
 
6
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(F,OH)
Uvite
Ca(Mg
 
3
)MgAl
 
5
(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
(F/OH)
Vanadio-oxy-chromium-dravite
Na(V)
 
3
(Cr
 
4
Mg
 
2
)(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O
Vanadio-oxy-dravite
NaV
 
3
(Al
 
4
Mg
 
2
)(Si
 
6
O
 
18
)(BO
 
3
)
 
3
(OH)
 
3
O

Other Names for Tsilaisite

Synonyms:
IMA2011-047Unnamed (Mn-dominant tourmaline)
Other Languages:
German:Tsilaisit
Simplified Chinese:钠锰电气石
Spanish:Tsilaisita

Other Information

Fluorescence in UV light:Shows no fluorescence
Health Warning: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

Best Localities for Tsilaisite

Best of Species:Tsilaisite

Internet Links for Tsilaisite

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