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Tancoite

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Formula:
LiNa2Al(PO4)(HPO4)(OH)
Colour:
Colorless to light pink
Lustre:
Vitreous, Sub-Vitreous
Hardness:
4 - 4½
Specific Gravity:
2.752
Crystal System:
Orthorhombic
Name:
Named in 1980 by Robert A. Ramik, Bozidar Darko Sturman, Pete J. Dunn, and Alexander Sergevich Povarennykh for its discovery locality, the Tanco Mine (pegmatite), Bernic Lake, Manitoba, Canada.
Colorless to pale pink tabular crystals


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Classification of TancoiteHide

Approved
Approval Year:
1979
First Published:
1980
8.BG.15

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
G : With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
41.4.7.1

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
4 : (AB)5(XO4)2Zq
19.8.4

19 : Phosphates
8 : Phosphates of Al and other metals

Physical Properties of TancoiteHide

Vitreous, Sub-Vitreous
Transparency:
Transparent
Colour:
Colorless to light pink
Streak:
White
Hardness:
4 - 4½ on Mohs scale
Tenacity:
Brittle
Cleavage:
Imperfect/Fair
{010} and {100}
Fracture:
Conchoidal, Sub-Conchoidal
Density:
2.752 g/cm3 (Measured)    2.724 g/cm3 (Calculated)

Optical Data of TancoiteHide

Type:
Biaxial (-)
RI values:
nα = 1.541 nβ = 1.563 nγ = 1.564
2V:
Measured: 23° , Calculated: 24°
Birefringence:
0.023
Max Birefringence:
δ = 0.023
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Low
Dispersion:
r
Optical Extinction:
XYZ = cba
Pleochroism:
Non-pleochroic

Chemical Properties of TancoiteHide

Formula:
LiNa2Al(PO4)(HPO4)(OH)
IMA Formula:
HLiNa2[Al(PO4)2(OH)]

Crystallography of TancoiteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pbca
Cell Parameters:
a = 14.08 Å, b = 14.13 Å, c = 6.97 Å
Ratio:
a:b:c = 0.996 : 1 : 0.493
Unit Cell V:
1,386.68 ų (Calculated from Unit Cell)
Z:
8
Comment:
Pbcb

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.672 (100)
3.413 (90)
3.150 (100)
2.479 (90)
1.760 (40)
1.438 (40)
1.429 (40)

Type Occurrence of TancoiteHide

Geological Setting of Type Material:
LCA granite pegmatite
Associated Minerals at Type Locality:
Reference:
Ramik, R.A., Sturman, B.D., Dunn, P.J., Povarennykh, A.S. (1980) Tancoite, a new lithium sodium aluminum phosphate from the Tanco pegmatite, Bernic Lake, Manitoba. Canadian Mineralogist: 18: 185-190.

Synonyms of TancoiteHide

Other Language Names for TancoiteHide

German:Tancoit
Spanish:Tancoita

Related Minerals - Nickel-Strunz GroupingHide

8.BG.CanosioiteBa2Fe3+(AsO4)2(OH)Mon. 2/m : P21/m
8.BG.05ArsentsumebitePb2Cu(AsO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05BearthiteCa2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05BrackebuschitePb2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GamagariteBa2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05GoedkeniteSr2Al(PO4)2(OH)Mon. 2/m : P21/m
8.BG.05UM1994-19-PO:CuHMoPbPb2Cu(PO4)(MoO4,AsO4,CrO4,GaO4)(OH)
8.BG.05TsumebitePb2Cu(PO4)(SO4)(OH)Mon. 2/m : P21/m
8.BG.05ArsenbrackebuschitePb2Fe3+(AsO4)2(OH)Mon. 2/m : P2/m
8.BG.05FeinglositePb2Zn(AsO4)2 · H2OMon. 2/m
8.BG.05BushmakinitePb2Al(PO4)(VO4)(OH)Mon. 2/m : P21/m
8.BG.05TokyoiteBa2Mn3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.05CalderónitePb2Fe3+(VO4)2(OH)Mon. 2/m : P21/m
8.BG.10MélonjosephiteCaFe2+Fe3+(PO4)2(OH)

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

19.8.1MontebrasiteLiAl(PO4)(OH)Tric. 1 : P1
19.8.2BrazilianiteNaAl3(PO4)2(OH)4Mon. 2/m : P2/b
19.8.3WarditeNaAl3(PO4)2(OH)4 · 2H2OTet. 4 2 2 : P41 21 2
19.8.5Bertossaite(Li,Na)2(Ca,Fe2+,Mn2+)Al4(PO4)4(OH,F)4Orth.
19.8.6TinsleyiteKAl2(PO4)2(OH) · 2H2OMon.
19.8.7Taranakite(K,NH4)Al3(PO4)3(OH) · 9H2OTrig. 3m (3 2/m) : R3c
19.8.8FrancoanelliteK3Al5(PO4)2(HPO4)3 · 12H2OTrig.
19.8.9GordoniteMgAl2(PO4)2(OH)2 · 8H2OTric. 1 : P1
19.8.10AldermaniteMg5Al12(PO4)8(OH)22 · 32H2OOrth.
19.8.11OveriteCaMgAl(PO4)2(OH) · 4H2OOrth. mmm (2/m 2/m 2/m) : Pbca
19.8.12MontgomeryiteCa4MgAl4(PO4)6(OH)4 · 12H2OMon. 2 : B2
19.8.14FoggiteCaAl(PO4)(OH)2 · H2OOrth.
19.8.15GatumbaiteCaAl2(PO4)2(OH)2 · H2OMon. 2/m : P2/m
19.8.16CrandalliteCaAl3(PO4)(PO3OH)(OH)6Trig. 3m (3 2/m) : R3m
19.8.17Matulaite(Fe3+,Al)Al7(PO4)4(PO3OH)2(OH)8(H2O)8 · 8H2OMon.
19.8.19LehiiteCaAl3(PO4)(PO3OH)(OH)6
19.8.20Millisite(Na,K)CaAl6(PO4)4(OH)9 · 3H2OTet.
19.8.21EnglishiteK3Na2Ca10Al15(PO4)21(OH)7 · 26H2OMon. 2/m
19.8.22KleemaniteZnAl2(PO4)2(OH)2 · 3H2OMon.
19.8.23MantienneiteKMg2Al2Ti(PO4)4(OH)3 · 15H2OOrth.
19.8.24PaulkerriteK(Mg,Mn2+)2(Fe3+,Al,Ti,Mg)2Ti(PO4)4(OH)3 · 15H2OOrth. mmm (2/m 2/m 2/m) : Pbca

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 TancoiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Ramik, R.A., Sturman, B.D., Dunn, P.J., Povarennykh, A.S. (1980) Tancoite, a new lithium sodium aluminum phosphate from the Tanco pegmatite, Bernic Lake, Manitoba. Canadian Mineralogist: 18: 185-190.
Hawthorne, F.C. (1983) The crystal structure of tancoite. Tschermaks Mineralogische und Petrographische Mitteilungen: 31: 121-135.

Internet Links for TancoiteHide

Localities for TancoiteHide

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.
Canada (TL)
 
  • Manitoba
    • Lac-du-Bonnet area
      • Bernic Lake
RAMIK, R.A., STURMAN, B.D., DUNN, P.J. & POVARENNYKH, A.S. (1980): Tancoite, a new lithium sodium aluminum phosphate from the Tanco pegmatite, Bernic Lake, Manitoba. Canadian Mineralogist 18, 185-190. HAWTHORNE, F.C. (1983): The crystal structure of tancoite. Tschermaks Mineralogische und Petrographische Mitteilungen 31, 121-135.
Mineral and/or Locality  
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