Segnitite Mineral Data

General Segnitite Information

Help on Chemical Formula: Chemical Formula: PbFe+++3H(AsO4)2(OH)6

Help on Composition: Composition: Molecular Weight = 755.63 gm

Iron 22.17 % Fe 31.70 % Fe₂O₃

Arsenic 19.83 % As 30.42 % As₂O₅

Hydrogen 0.93 % H 8.34 % H₂O

Lead 27.42 % Pb 29.54 % PbO

100.00 % 100.00 % = TOTAL OXIDE

Help on Empirical Formula: Empirical Formula: PbFe³⁺₃H(AsO₄)₂(OH)₆

Help on Environment: Environment: Oxidized zone of a Pb-Zn orebody.

Help on IMA Status: IMA Status: Approved IMA 1992

Help on Locality: Locality: Broken Hill, New South Wales, and at Coppin Pool, about 41 km east-southeast of Mt. Tom Price, Western Australia. Link to MinDat.org Location Data.

Help on Name Origin: Name Origin: Named for E. Ralph Segnit (1923-1999), mineralogist and petrologist, University of Adelaide, Adelaide, Australia, for his contributions to Australian mineralogy.

Help on Synonym: Synonym: ICSD 40681

Segnitite

Comments: Translucent yellow crystalline segnitite crust.
Location: Kintore Open Cut, Broken Hill, New South Wales, Australia. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Segnitite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:2.32545

Help on Cell Dimensions: Cell Dimensions: a = 7.359, c = 17.113, Z = 3; V = 802.59 Den(Calc)= 4.69

Help on Crystal System: 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): 3.092(1), 5.966(0.5), 3.678(0.4),

Physical Properties of Segnitite

Help on Cleavage: Cleavage: {???} Good

Help on Color: Color: Greenish brown, Yellow brown.

Help on Diaphaneity: Diaphaneity: Transparent to Translucent

Help on Hardness: Hardness: 4 - Fluorite

Help on Luster: Luster: Adamantine

Help on Streak: Streak: light yellow

Optical Properties of Segnitite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2058,KC= 0.2168
Ncalc = 2.02

Help on Optical Data: Optical Data: Uniaxial (-), e=1.955, w=1.975, bire=0.0200.

Calculated Properties of Segnitite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=4.28 gm/cc
note: Specific Gravity of Segnitite =4.69 gm/cc.

Help on Fermion Index: Fermion Index: Fermion Index = 0.06
Boson Index = 0.94

Help on Photoelectric: Photoelectric: PE_Segnitite= 482.13 barns/electron
U=PE_Segnitite x rElectron Density=2,064.79 barns/cc.

Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Segnitite is Not Radioactive

Segnitite Classification

Help on Dana Class: Dana Class: 42.07.04.04 (42)Hydrated Phosphates, etc., Containing Hydroxyl or Halogen

(42.07)where (AB)5 (XO4)3 Zq ƒL x(H2O)

(42.07.04)Arsenocrandallite Group

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

42.07.04.02 Philipsbornite PbAl3(AsO4)2(OH)5•(H2O) R 3m-,R 3m Trig

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

42.07.04.04 Segnitite PbFe3H(AsO4)2(OH)6 R 3m 3 2/m

Help on Strunz Class: 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 Segnitite Information

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Am.Min.,Vol.77,p656-659,1992) OPTIC PROP.(Am.Min.,Vol.77,p656-659,1992)

Help on See Also: See Also: Links to other databases for Segnitite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Segnitite Specimen Label here :

Segnitite

PbFe+++3H(AsO4)2(OH)6
Dana No: 42.07.04.04 Strunz No: 08.BL.10
Locality:

Notes: