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Tsilaisite

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Formula:
Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
Colour:
Greenish yellow
Lustre:
Vitreous
Hardness:
7
Specific Gravity:
3.133 (Calculated)
Crystal System:
Trigonal
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.


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Classification of TsilaisiteHide

Approved
Notes:
Renamed by the IMA
Approval History:
Renamed by IMA: 2011

Physical Properties of TsilaisiteHide

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

Optical Data of TsilaisiteHide

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 TsilaisiteHide

Formula:
Na(Mn2+)3Al6(Si6O18)(BO3)3(OH)3(OH)
IMA Formula:
NaMn2+3Al6(Si6O18)(BO3)3(OH)3OH
Idealised Formula:
NaMn3Al6(Si6O18)(BO3)3(OH)3OH

Crystallography of TsilaisiteHide

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 V:
1571.9 ų
Z:
3

X-Ray Powder DiffractionHide

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)

Type Occurrence of TsilaisiteHide

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:

Synonyms of TsilaisiteHide

Other Language Names for TsilaisiteHide

German:Tsilaisit
Simplified Chinese:钠锰电气石
Spanish:Tsilaisita

Relationship of Tsilaisite to other SpeciesHide

Other Members of this group:
AdachiiteCaFe3Al6(Si5AlO18)(BO3)3(OH)3(OH)Trig. 3m : R3m
BosiiteNaFe3+3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Chromium-draviteNa(Mg3)Cr3+6(Si6O18)(BO3)3(OH)3(OH)Trig.
Chromo-alumino-povondraiteNa(Cr3)(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
DarrellhenryiteNa(LiAl2)Al6(BO3)3Si6O18(OH)3O Trig. 3m : R3m
DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
Fluor-draviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-elbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-feruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3F
Fluor-liddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-schorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-tsilaisiteNa(Mn2+)3Al6(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Fluor-uviteCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3FTrig. 3m : R3m
Foitite(□,Na)(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OHTrig. 3m : R3m
LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
LucchesiiteCaFe2+3 Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Luinaite-(OH)Na(Fe2+)3Al6(Si6O18)(BO3)3(OH)3(OH)Mon. m : Bm
Magnesio-foitite(□,Na)(Mg2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig.
MaruyamaiteK(MgAl2)(Al5Mg)(BO3)3(Si6O18)(OH)3OTrig. 3m : R3m
OleniteNa(Al3)Al6(Si6O18)(BO3)3O3(OH)Trig.
Oxy-chromium-draviteNa(Cr)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Oxy-draviteNa(MgAl2)MgAl5(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-foitite□(Fe2+Al2)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m (3 2/m) : R3m
Oxy-rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3O
Oxy-schorlNa(Fe2+2Al)Al6(Si6O18)(BO3)3(OH)3OTrig. 3m : R3m
Oxy-uviteCaMg3Al6(Si6O18)(BO3)3(OH)3O
Oxy-vanadium-draviteNa(V)3(V4Mg2)Si6O18(BO3)3(OH)3OTrig. 3m : R3m
PovondraiteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3OTrig.
Rossmanite☐(LiAl2)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
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)
Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
Vanadio-oxy-chromium-draviteNa(V)3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O Trig. 3m : R3m
Vanadio-oxy-draviteNaV3(Al4Mg2)(Si6O18)(BO3)3(OH)3OTrig. 3m

Fluorescence of TsilaisiteHide

Shows no fluorescence

Other InformationHide

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 TsilaisiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
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 TsilaisiteHide

Localities for TsilaisiteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Italy (TL)
 
  • Tuscany
    • Livorno Province
      • Elba Island
        • Campo nell'Elba
          • San Piero in Campo
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
Russia
 
  • Eastern-Siberian Region
    • Transbaikalia (Zabaykalye)
      • Chitinskaya Oblast'
AmMin 88:1369-1376 (2003)
Mineral and/or Locality  
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