Tancoite Mineral Data

Tancoite Mineral Data +

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General Tancoite Information

Chemical Formula:

HNa2LiAl(PO4)2(OH)

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

Empirical Formula:

LiNa₂HAl(PO₄)₂(OH)

IMA Status:

Approved IMA 1979

Locality:

Tanco spodumene-bearing pegmatite mine at Bernic Lake, MB, Canada. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 31274

IMA1979-045

PDF 33-602

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Tancoite Crystallography

Axial Ratios:

a:b:c =0.4983:1:0.4936

Cell Dimensions:

a = 7.041, b = 14.13, c = 6.975, Z = 4; V = 693.94 Den(Calc)= 2.76

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/I_o): 3.15(1), 4.672(1), 3.413(0.9),

Physical Properties of Tancoite

Cleavage:

[010] Distinct, [001] Distinct

Color:

Colorless, Light pink.

Density:

2.752

Diaphaniety:

Transparent

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Habit:

Columnar - Forms columns

Habit:

Druse - Crystal growth in a cavity which results in numerous crystal tipped surfaces.

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Tancoite

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

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

Electron Density:

r_electron=2.72 gm/cc
note: r_Tancoite=2.75 gm/cc.

Fermion Index

Fermion Index = 0.00204
Boson Index = 0.99796

Photoelectric:

PE_Tancoite= 1.58 barns/electron
U=PE_Tancoite x r_electron= 4.30 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Tancoite is Not Radioactive

Tancoite Classification

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

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

References:

NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Dana8)

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: