Zairite Mineral Data

Zairite Mineral Data +

General Zairite Information

Chemical Formula:

Bi(Fe+++,Al)3(PO4)2(OH)6

Composition:

Molecular Weight = 646.86 gm

Aluminum 3.13 % Al 5.91 % Al₂O₃

Iron 19.43 % Fe 27.77 % Fe₂O₃

Bismuth 32.31 % Bi 36.02 % Bi₂O₃

Phosphorus 9.58 % P 21.94 % P₂O₅

Hydrogen 0.93 % H 8.36 % H₂O

Oxygen 34.63 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

BiFe³⁺_2.25Al_0.75(PO₄)₂(OH)₆

IMA Status:

Approved IMA 1975

Locality:

Link to MinDat.org Location Data.

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Zairite Crystallography

Axial Ratios:

a:c = 1:2.33285

Cell Dimensions:

a = 7.015, c = 16.365, Z = 3; V = 697.43 Den(Calc)= 4.62

Crystal System:

Trigonal - Hexagonal ScalenohedralH-M Symbol (3 2/m) Space Group: R 3m

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

By Intensity(I/I_o): 2.945(1), 5.71(0.95), 3.503(0.4),

Physical Properties of Zairite

Color:

Greenish, Greenish white, Yellow green.

Density:

4.37

Diaphaniety:

Transparent to Translucent

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Resinous

Streak:

white

Optical Properties of Zairite

Gladstone-Dale:

CI meas= 0.163 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= 0.208 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1769,KPDmeas= 0.1871,KC= 0.2234

Optical Data:

Uniaxial (-), e=1.81, w=1.82-1.83, bire=0.0100-0.0200.

Calculated Properties of Zairite

Electron Density:

r_electron=4.04 gm/cc
note: r_Zairite=4.37 gm/cc.

Fermion Index

Fermion Index = 0.00428
Boson Index = 0.99572

Photoelectric:

PE_Zairite= 568.65 barns/electron
U=PE_Zairite x r_electron=2,299.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Zairite is Not Radioactive

Zairite Classification

Dana Class:

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

(41.5)where (A B)2 (XO4) Zq

(41.5.12)Dana Group

41.5.12.1 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

41.5.12.2 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

41.5.12.3 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

41.5.12.4 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

Strunz Class:

VII/B.36-170 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.36 - Crandallite group

VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m

VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m

VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig

VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m

VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-125 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m

VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m

VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

VII/B.36-150* Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m

VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m

Other Zairite 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 Zairite :
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 -École des Mines de Paris

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Zairite

Bi(Fe+++,Al)3(PO4)2(OH)6
Dana No: 41.5.12.3 Strunz No: VII/B.36-170
Locality:

Notes: