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 - Valid Species (Pre-IMA) 1958

Locality:

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

Name Origin:

Named in 1958 for the Lusungu River, Zaire.

Synonym:

Discredited IMA 1995

Lusungite Image

Images:

Lusungite Kintoreite

Comments: Greenish-yellow kintoreite crystals on limonite and or goethite. The specimen was originally labelled lusungite in the early 1990's and reinvestigation of the specimen showed it to be kintoreite.
Location: Kintore Open Cut, Broken Hill, NSW, Australia. Scale: Specimen Size 3x6 cm.
© Diederik Visser

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

Diaphaneity:

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:

Bulk Density (Electron Density)=3.81 gm/cc
note: Specific Gravity of Lusungite =3.99 gm/cc.

Fermion Index:

Fermion Index = 0.03
Boson Index = 0.97

Photoelectric:

PE_Lusungite= 166.03 barns/electron
U=PE_Lusungite x rElectron Density= 632.61 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Lusungite is Not Radioactive

Lusungite Classification

Dana Class:

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

(42.07)where (AB)5 (XO4)3 Zq · x(H2O)

(42.07.03)Crandallite Group

42.07.03.01 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

42.07.03.02 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

42.07.03.03 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

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

42.07.03.05 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

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

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

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

Strunz Class:

08.BL.10 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BL -With medium-sized and large cations, (OH, etc.):RO4 = 3:1

08.BL.10 Arsenogorceixite! BaAl3AsO3(OH)(AsO4,PO4)(OH,F)6 R 3m 3 2/m

08.BL.10 Arsenocrandallite (Ca,Sr)Al3[(As,P)O4]2(OH)5•(H2O) R 3m 3m

08.BL.10 Ferrazite? (Pb,Ba)3(PO4)2•8(H2O)(?) Tri

08.BL.10 Arsenowaylandite* BiAl3(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Benauite! HSrFe3(PO4)2(OH)6 R 3m 3 2/m

08.BL.10 Arsenogoyazite (Sr,Ca,Ba)Al3(AsO4,PO4)2(OH,F)5•(H2O) R 3m 3 2/m

08.BL.10 Dussertite BaFe3(AsO4)2(OH)5 R 3m 3m

08.BL.10 Crandallite CaAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Goyazite SrAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Gorceixite BaAl3(PO4)(PO3OH)(OH)6 R 3m 3 2/m

08.BL.10 Kintoreite PbFe3(PO4)2(OH,H2O)6 R 3m 3 2/m

08.BL.10 Lusungite? (Sr,Pb)Fe3(PO4)2(OH)5•(H2O) R 3m 3m

08.BL.10 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

08.BL.10 Plumbogummite PbAl3(PO4)2(OH)5•(H2O) R 3m 3 2/m

08.BL.10 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

08.BL.10 Springcreekite! BaV3(PO4)2(OH,H2O)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 - Google Images
4 - Google Scholar
5 - MinDAT
6 - MinMax(Deutsch)
7 - MinMax(English)
8 - Mineralienatlas (Deutsch)
9 - QUT Mineral Atlas
10 - Ruff.Info
11 - WWW-MINCRYST

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Lusungite

(Sr,Pb)Fe+++3(PO4)2(OH)5•(H2O)
Dana No: 42.07.03.04 Strunz No: 08.BL.10
Locality:

Notes: