Lusungite Mineral Data

Lusungite Mineral Data

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General Lusungite Information

Chemical Formula:

(Sr,Pb)Fe+++3(PO4)2(OH)5·(H2O)

Composition:

Molecular Weight = 578.05 gm

Strontium 11.37 % Sr 13.44 % SrO

Iron 28.98 % Fe 41.44 % Fe₂O₃

Phosphorus 10.72 % P 24.56 % P₂O₅

Hydrogen 1.22 % H 10.91 % H₂O

Lead 8.96 % Pb 10.35 % PbO₂

Oxygen 38.75 % O

______ ______

100.00 % 100.69 % = TOTAL OXIDE

Empirical Formula:

Sr_0.75Pb_0.25Fe³⁺₃(PO₄)₂(OH)₅·(H₂O)

Environment:

Found with iron oxyhydroxides ("limonite"). Discredited as being equal to benauite.

IMA Status:

Discredited IMA 1983

Locality:

Kookobo, Kivu, Zaire. Link to MinDat.org Location Data.

Name Origin:

Named in 1958 for the Lusungu River, Zaire.

Synonym:

Discredited IMA 1995

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Lusungite Crystallography

Axial Ratios:

a:c = 1:2.38636

Cell Dimensions:

a = 7.04, c = 16.8, Z = 3; V = 721.08 Den(Calc)= 3.99

Crystal System:

Trigonal - Ditrigonal PyramidalH-M Symbol (3m) Space Group: R 3m

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

By Intensity(I/I_o): 2.98(1), 5.77(0.9), 3.53(0.6),2.48(0.4), 1.913(0.2), 2.22(0.2), 2.26(0.2), 2.2(0.1),

Physical Properties of Lusungite

Color:

Dark brown, Yellowish brown.

Density:

4.06

Diaphaniety:

Translucent

Habit:

Encrustations - Forms crust-like aggregates on matrix.

Streak:

yellowish brown

Optical Properties of Lusungite

Optical Data:

Uniaxial (?).

NCalc= 1.97 - from Gladstone-Dale relationship (KC = 0.2429) where Ncalc=Dcalc*KC+1
NCalc= 1.99 - from Gladstone-Dale relationship (KC = 0.2429) where Ncalc=Dmeas*KC+1

Calculated Properties of Lusungite

Electron Density:

r_electron=3.81 gm/cc
note: r_Lusungite=3.99 gm/cc.

Fermion Index

Fermion Index = 0.03409
Boson Index = 0.96591

Photoelectric:

PE_Lusungite= 166.03 barns/electron
U=PE_Lusungite x r_electron= 632.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Lusungite is Not Radioactive

Lusungite Classification

Dana Class:

42.7.3.4 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.7)where (AB)5 (XO4)3 Zq · x(H2O)

(42.7.3)Dana Group

42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m

42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.4 Lusungite ? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m

42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m

42.7.3.6 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

42.7.3.7 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

42.7.3.8 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m

Strunz Class:

VII/B.36-150* 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 Lusungite Information

References:

NAME( Dana8)

See Also:

Links to other databases for Lusungite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - Crocoite.com Mineral Locations 4 -Google Images 5 -Google Scholar 6 -MinDAT 7 -MinMax(Deutsch) 8 -MinMax(English) 9 -Mineralienatlas (Deutsch) 10 -QUT Mineral Atlas 11 - WWW-MINCRYST

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Lusungite

(Sr,Pb)Fe+++3(PO4)2(OH)5·(H2O)
Dana No: 42.7.3.4 Strunz No: VII/B.36-150*
Locality:

Notes: