General Lusungite Information
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Chemical Formula: |
(Sr,Pb)Fe+++3(PO4)2(OH)5·(H2O) |
Composition: |
Molecular Weight = 578.05 gm |
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Strontium 11.37 % Sr 13.44 % SrO |
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Iron 28.98 % Fe 41.44 % Fe2O3 |
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Phosphorus 10.72 % P 24.56 % P2O5 |
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Hydrogen 1.22 % H 10.91 % H2O |
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Lead 8.96 % Pb 10.35 % PbO2 |
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Oxygen 38.75 % O |
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______ ______ |
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100.00 % 100.69 % = TOTAL OXIDE |
Empirical Formula: |
Sr0.75Pb0.25Fe3+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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Search for Lusungite Images |
Images:
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Lusungite Crystallography
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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 |
X Ray Diffraction: |
By Intensity(I/Io): 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), |
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Physical Properties of Lusungite
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Color: |
Dark brown, Yellowish brown. |
Density: |
4.06 |
Diaphaniety: |
Translucent |
Habit: |
Encrustations - Forms crust-like aggregates on matrix. |
Streak: |
yellowish brown |
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Optical Properties of Lusungite
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Optical Data: |
Uniaxial (?). |
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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 |
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Calculated Properties of Lusungite
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Electron Density: |
relectron=3.81 gm/cc note: rLusungite =3.99 gm/cc. |
Fermion Index |
Fermion Index = 0.03409 Boson Index = 0.96591 |
Photoelectric: |
PELusungite = 166.03 barns/electron U=PELusungite x relectron= 632.61 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Lusungite is Not Radioactive |
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Lusungite Classification
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Dana Class: |
42.7.3.4 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen |
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(42.7)where (AB)5 (XO4)3 Zq · x(H2O) |
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(42.7.3)Dana Group |
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42.7.3.1 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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42.7.3.2 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m |
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42.7.3.3 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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42.7.3.4 Lusungite ? (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m |
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42.7.3.5 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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42.7.3.6 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m |
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42.7.3.7 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m |
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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 |
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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 |
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VII/B.36 - Crandallite group |
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VII/B.36-10 Crandallite CaAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-20 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5·(H2O) R 3m 3m |
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VII/B.36-30 Goyazite SrAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-40 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5·(H2O) R 3m 3 2/m |
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VII/B.36-50 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 Cm m |
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VII/B.36-60 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m |
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VII/B.36-70 Plumbogummite PbAl3(PO4)2(OH)5·(H2O) R 3m 3 2/m |
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VII/B.36-80 Philipsbornite PbAl3(AsO4)2(OH)5·(H2O) R 3m-,R 3m Trig |
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VII/B.36-90 Waylandite BiAl3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-100 Eylettersite (Th,Pb)1-xAl3(PO4,SiO4)2(OH)6(?) R 3m 3 2/m |
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VII/B.36-110 Florencite-(Ce) CeAl3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-120 Arsenoflorencite-(Ce) (Ce,La)Al3(AsO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-125 Arsenoflorencite-(La)* (La,Sr)Al3(AsO4,SO4,PO4)2(OH)6 R 3m 3m |
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VII/B.36-130 Florencite-(La) (La,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-135 Arsenoflorencite-(Nd)* (Nd,La,Ce,Ba)(Al,Fe)3(AsO4,PO4)2(OH)6 R 3m 3m |
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VII/B.36-140 Florencite-(Nd) (Nd,Ce)Al3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-150 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-150* Lusungite (Sr,Pb)Fe3(PO4)2(OH)5·(H2O) R 3m 3m |
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VII/B.36-152 Graulichite-(Ce)! CeFe3(AsO4)2(OH)6 R 3m 3 2/m |
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VII/B.36-155 Springcreekite! BaV3(PO4)2(OH,H2O)6 R 3m 3 2/m |
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VII/B.36-160 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m |
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VII/B.36-170 Zairite Bi(Fe,Al)3(PO4)2(OH)6 R 3m 3 2/m |
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Other Lusungite Information
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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:
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