Tancoite Mineral Data

Tancoite Mineral Data +

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

Search for Tancoite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

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

Search for Tancoite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Tancoite :
AA Mineral Specimens
A-Rocks Auction
Adams Minerals
B and L Minerals
Dakota Matrix
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Minernet.it
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Tancoite Mineral Data :

Ask about Tancoite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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: