Mineralogy Database

Segnitite Mineral Data

Search Webmineral :
  
Advertisment

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
   Oxygen    29.64 %  O
            ______        ______ 
            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
  IMA1991-017
  PDF 45-1392
 

Segnitite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image

  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 Scalenohedral H-M Symbol (3 2/m) Space Group: R 3m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 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: PESegnitite = 482.13 barns/electron
U=PESegnitite 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 � 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

Search for Segnitite using:

Google
 
Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Segnitite :

Ask about Segnitite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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:

 

 
   
 


Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.