Mineralogy Database

Tancoite Mineral Data

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General Tancoite Information

Help on Chemical  Formula: Chemical Formula: HNa2LiAl(PO4)2(OH)
Help on Composition: Composition: Molecular Weight = 287.86 gm
   Sodium      15.97 %  Na   21.53 % Na2O
   Lithium      2.41 %  Li    5.19 % Li2O
   Aluminum     9.37 %  Al   17.71 % Al2O3
   Phosphorus  21.52 %  P    49.31 % P2O5
   Hydrogen     0.70 %  H     6.26 % H2O
   Oxygen      50.02 %  O
              ______        ______ 
              100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: LiNa2HAl(PO4)2(OH)
Help on IMA Status: IMA Status: Approved IMA 1979
Help on Locality: Locality: Tanco spodumene-bearing pegmatite mine at Bernic Lake, MB, Canada. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Tancoite Say TANCOITE
Help on Synonym: Synonym: ICSD 31274
  PDF 33-602

Tancoite Image

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Comments: SEM image of tabular tancoite crystals.
Location: Tanco Mine, Manitoba, Canada. Scale: Field of View 1 mm.
© Royal Ontario Museum

Tancoite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.4983:1:0.4936
Help on Cell Dimensions: Cell Dimensions: a = 7.041, b = 14.13, c = 6.975, Z = 4; V = 693.94 Den(Calc)= 2.76
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pbcb
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.15(1), 4.672(1), 3.413(0.9),

Physical Properties of Tancoite

Help on Cleavage: Cleavage: {010} Distinct, {001} Distinct
Help on Color: Color: Colorless, Light pink.
Help on Density: Density: 2.752
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Columnar - Forms columns
Help on Habit: Habit: Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.
Help on Hardness: Hardness: 4-4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous (Glassy)
Help on Streak: Streak: white

Optical Properties of Tancoite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.015 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.017 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2014,KPDmeas= 0.202,KC= 0.205
Ncalc = 1.56 - 1.57
Help on Optical Data: Optical Data: Biaxial (-), a=1.541, b=1.563, g=1.564, bire=0.0230, 2V(Calc)=22, 2V(Meas)=23. Dispersion weak, r < v.

Calculated Properties of Tancoite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.72 gm/cc
note: Specific Gravity of Tancoite =2.75 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0020495888
Boson Index = 0.9979504112
Help on Photoelectric: Photoelectric: PETancoite = 1.58 barns/electron
U=PETancoite x rElectron Density= 4.30 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Tancoite is Not Radioactive

Tancoite Classification

Help on  Dana Class: Dana Class: (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.04)where (A B)5 (XO4)2 Zq
  (41.04.07)Dana Group Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 08.BG.15 08 - PHOSPHATES, ARSENATES, VANADATES
  08.B - Phosphates, etc. with Additional Anions, without H2O
  08.BG -With medium-sized and large cations, (OH, etc.):RO4 = 0.5:1
08.BG.15 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m

Other Tancoite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)
Help on See Also: See Also: Links to other databases for Tancoite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Dana No: Strunz No: 08.BG.15





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