Nabiasite Mineral Data

Nabiasite Mineral Data

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General Nabiasite Information

Chemical Formula:

BaMn9[(V,As)O4]6(OH)2

Composition:

Molecular Weight = 1,372.20 gm

Barium 10.01 % Ba 11.17 % BaO

Manganese 36.03 % Mn 46.53 % MnO

Vanadium 19.68 % V 35.12 % V₂O₅

Arsenic 3.82 % As 5.86 % As₂O₅

Hydrogen 0.15 % H 1.31 % H₂O

Oxygen 30.32 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BaMn²⁺₉(VO₄)_5.3(AsO₄)_0.7(OH)₂

Environment:

In veinlets cross-cutting manganese ores.

IMA Status:

Approved IMA 1998 (Dana # Added)

Locality:

Pla de Labasse deposit near the hamlet of Nabias, Central Pyrenees, France. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Synonym:

ICSD 68186

IMA1997-050

PDF 42-1337

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Nabiasite Crystallography

Cell Dimensions:

a = 12.845, Z = 4; V = 2,119.35 Den(Calc)= 4.30

Crystal System:

Isometric - DiploidalH-M Symbol (2/m 3) Space Group: P a3

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 2.134(1), 2.332(1), 3.01(1),1.51(1), 2.79(1), 2.608(1), 2.859(0.8),

Crystal Structure:

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Brugger J , Bonin M , Schenk K J , Meisser N , Berlepsch P , Ragu A , European Journal of Mineralogy , 11 (1999) p.879-890, Description and crystal structure of nabiasite, BaMn9[(V,As)O4]6(OH)2,, a new mineral from the Central Pyrenees (France), Locality: Central Pyrenees, France

Physical Properties of Nabiasite

Cleavage:

None

Color:

Dark red.

Diaphaniety:

Transparent

Fracture:

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

Habit:

Anhedral Grains - Granular minerals without the expression of crystal shapes

Hardness:

4-4.5 - Between Fluorite and Apatite

Luster:

Adamantine

Streak:

dark orangish yellow

Optical Properties of Nabiasite

Gladstone-Dale:

CI calc= -0.02 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2442,KC= 0.2393

Optical Data:

Isotropic, n=2-2.1.

Calculated Properties of Nabiasite

Electron Density:

r_electron=3.99 gm/cc
note: r_Nabiasite=4.30 gm/cc.

Fermion Index

Fermion Index = 0.01847
Boson Index = 0.98153

Photoelectric:

PE_Nabiasite= 59.43 barns/electron
U=PE_Nabiasite x r_electron= 236.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Nabiasite is Not Radioactive

Nabiasite Classification

Dana Class:

38.2.6.1 (38)Anhydrous Phosphates, etc

(38.2)(A+ B++)5 (XO4)3

(38.2.6)Dana Group

38.2.6.1 Nabiasite ! BaMn9[(V,As)O4]6(OH)2 P a3 2/m 3

Strunz Class:

VII/B.20-40 VII - Phosphates, Arsenates and Vanadates

VII/B - Waterfree phosphates with unfamiliar anions F, Cl, O, OH. cations of medium and big size: Mg, Cu, Zn, and Ca, Na, K, Ba, Pb

VII/B.20 - Arrojadite - Samuelsonite series

VII/B.20-10 Arrojadite KNa4CaMn4Fe10Al(PO4)12(OH,F)2 C 2/c 2/m

VII/B.20-20 Dickinsonite KNa4Ca(Mn,Fe)14Al(PO4)12(OH)2 C 2/c 2/m

VII/B.20-25 Sigismundite! (Ba,K,Pb)Na3(Ca,Sr)(Fe,Mg,Mn)14Al(OH)2(PO4)12 C 2/c 2/m

VII/B.20-30 Samuelsonite (Ca,Ba)Ca8(Fe,Mn)4Al2(PO4)10(OH)2 C 2/m 2/m

VII/B.20-40 Nabiasite BaMn9[(V,As)O4]6(OH)2 P a3 2/m 3

Other Nabiasite Information

References:

NAME( MinRec, Vol 31, No 4) PHYS. PROP.(MinRec, Vol 31, No 4) OPTIC PROP.(MinRec, Vol 31, No 4)

See Also:

Links to other databases for Nabiasite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 -Google Images 4 -Google Scholar 5 -Handbook of Mineralogy (UofA) 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas

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Nabiasite

BaMn9[(V,As)O4]6(OH)2
Dana No: 38.2.6.1 Strunz No: VII/B.20-40
Locality:

Notes: