Tancoite Mineral Data (original) (raw)

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

IMA1979-045

PDF 33-602

Tancoite Image

Click Here for Larger Tancoite Image in a New Browser Window Images:

Click Here for Larger Tancoite Image Tancoite 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 - 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),

Click Here for Large Tancoite Structure Window Crystal Structure:

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| | Hawthorne F C , Tschermaks Mineralogische und Petrographische Mitteilungen , 31 (1983) p.121-135, The crystal structure of tancoite | | -------------------------------------------------------------------------------------------------------------------------------------- |

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:

41.04.07.01 (41)Anhydrous Phosphates, etc. Containing Hydroxyl or Halogen

(41.04)where (A B)5 (XO4)2 Zq

(41.04.07)Dana Group

41.04.07.01 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
15 - WWW-MINCRYST

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

Tancoite

HNa2LiAl(PO4)2(OH)
Dana No: 41.04.07.01 Strunz No: 08.BG.15
Locality:

Notes: