Bahianite Mineral Data

Bahianite Mineral Data +

General Bahianite Information

Chemical Formula:

Al5Sb+++++3O14(OH)2

Composition:

Molecular Weight = 758.16 gm

Aluminum 17.79 % Al 33.62 % Al₂O₃

Antimony 48.18 % Sb 64.00 % Sb₂O₅

Hydrogen 0.27 % H 2.38 % H₂O

Oxygen 33.76 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Al₅Sb₃O₁₄(OH)₂

IMA Status:

Approved IMA 1974

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 14050

PDF 29-2

Bahianite Image

Images:

Bahianite

Comments: Rounded grain of bahianite.
Location: Garimpo de Morro, Paramirim Region, Bahia, Brazil. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Bahianite Crystallography

Axial Ratios:

a:b:c =0.815:1:0.3821

Cell Dimensions:

a = 9.406, b = 11.541, c = 4.41, Z = 2; beta = 90.94° V = 478.66 Den(Calc)= 5.26

Crystal System:

Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 3.194(1), 3.24(1), 2.156(0.8),

Crystal Structure:

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Moore P B , Araki T , Neues Jahrbuch fur Mineralogie, Abhandlungen , 126 (1976) p.113-125, Bahianite, Al5Sb3O14(O,OH)2, a novel hexagonal close-packed oxide structure, Locality: Serra de Mangabeira, Bahia, Brazil

Physical Properties of Bahianite

Cleavage:

[100] Perfect

Color:

Colorless, Violet, Cream white, Light brown.

Density:

4.89 - 5.46, Average = 5.17

Diaphaniety:

Transparent

Hardness:

9 - Corundum

Luster:

Adamantine

Streak:

white

Optical Properties of Bahianite

Gladstone-Dale:

CI meas= 0.046 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.062 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1648,KPDmeas= 0.1675,KC= 0.1756

Optical Data:

Biaxial (-), a=1.81, b=1.87, g=1.92, bire=0.1100

Calculated Properties of Bahianite

Electron Density:

r_electron=4.75 gm/cc
note: r_Bahianite=5.18 gm/cc.

Fermion Index

Fermion Index = 0.00016
Boson Index = 0.99984

Photoelectric:

PE_Bahianite= 154.92 barns/electron
U=PE_Bahianite x r_electron= 735.98 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Bahianite is Not Radioactive

Bahianite Classification

Dana Class:

44.3.7.1 (44)Antimonates

(44.3)with miscellaneous formulae

(44.3.7)Dana Group

44.3.7.1 Bahianite Al5Sb3O14(OH)2 C 2/m 2/m

Strunz Class:

IV/D.27-10 IV - Oxides

IV/D - Oxides with metal : oxygen = 1:2 (MO2 and related compounds)

IV/D.27 - Bahianite - Sosedkoite series

IV/D.27-10 Bahianite Al5Sb3O14(OH)2 C 2/m 2/m

IV/D.27-20 Simpsonite Al4(Ta,Nb)3O13(OH) P 3 3

IV/D.27-30 Alumotantite AlTaO4 P bcn 2/m 2/m 2/m

IV/D.27-40 Rankamaite (Na,K,Pb,Li)3(Ta,Nb,Al)11(O,OH)30 Pban 2/m 2/m 2/m

IV/D.27-50 Sosedkoite (K,Na)5Al2(Ta,Nb)22O60 Pban 2/m 2/m 2/m

Other Bahianite Information

References:

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

See Also:

Links to other databases for Bahianite :
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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Bahianite

Al5Sb+++++3O14(OH)2
Dana No: 44.3.7.1 Strunz No: IV/D.27-10
Locality:

Notes: