Tancoite Mineral Data + Say TANCOITE


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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 Synonym: Synonym: ICSD 31274
  IMA1979-045
  PDF 33-602
 

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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 - DipyramidalH-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 Diaphaniety: Diaphaniety: 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
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:

relectron=2.72 gm/cc
note: rTancoite =2.75 gm/cc.

Help on Fermion Index Fermion Index Fermion Index = 0.00204
Boson Index = 0.99796
Help on Photoelectric: Photoelectric:

PETancoite = 1.58 barns/electron
U=PETancoite x relectron= 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: 41.4.7.1 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen
  (41.4)where (A B)5 (XO4)2 Zq
  (41.4.7)Dana Group
 
41.4.7.1 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m
Help on  Strunz Class: Strunz Class: VII/B.02-20 VII - Phosphates, Arsenates and Vanadates
  VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O,OH, cations of medium size: Mg, Mn, Fe, Cu, Zn, Pseudomalachite group and related compounds
  VII/B.02 - Amblygonite group, Griphite - Tavorite
 
VII/B.02-10 Griphite Ca(Mn,Na,Li)6FeAl2(PO4)6(F,OH)2 P a3 2/m 3
 
VII/B.02-20 Tancoite HNa2LiAl(PO4)2(OH) Pbcb 2/m 2/m 2/m
 
VII/B.02-30 Amblygonite (Li,Na)Al(PO4)(F,OH) P1 1
 
VII/B.02-40 Montebrasite LiAl(PO4)(OH,F) P1 1
 
VII/B.02-50 Natromontebrasite (Na,Li)Al(PO4)(OH,F) P1 1
 
VII/B.02-60 Tavorite LiFe(PO4)(OH) P1 or P1 Tri
 

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 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 - WWW-MINCRYST 13 -École des Mines de Paris

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Print or Cut-and-Paste your Tancoite Specimen Label here :

Tancoite

HNa2LiAl(PO4)2(OH)
Dana No: 41.4.7.1 Strunz No: VII/B.02-20
Locality:

 

Notes:

 

 
   
 
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