Segnitite Mineral Data

[How the Club Works] [Memberships - Junior, Deluxe , and Platinum] [FAQ] [Past Minerals]
Join the Club - Junior, Deluxe and Platinum Memberships Available
High Quality Minerals Sent to Your Home or School Each Month
Mineral of the Month Club - An Inexpensive Way to Enjoy Minerals

General Segnitite Information

Chemical Formula:

PbFe+++3H(AsO4)2(OH)6

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

Empirical Formula:

PbFe³⁺₃H(AsO₄)₂(OH)₆

Environment:

Oxidized zone of a Pb-Zn orebody.

IMA Status:

Approved IMA 1992

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.

Name Origin:

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

Synonym:

ICSD 40681

IMA1991-017

PDF 45-1392

Segnitite Image

Images:

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

Axial Ratios:

a:c = 1:2.32545

Cell Dimensions:

a = 7.359, c = 17.113, Z = 3; V = 802.59 Den(Calc)= 4.69

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

Cleavage:

{???} Good

Color:

Greenish brown, Yellow brown.

Diaphaneity:

Transparent to Translucent

Hardness:

4 - Fluorite

Luster:

Adamantine

Streak:

light yellow

Optical Properties of Segnitite

Gladstone-Dale:

CI calc= 0.051 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2058,KC= 0.2168
Ncalc = 2.02

Optical Data:

Uniaxial (-), e=1.955, w=1.975, bire=0.0200.

Calculated Properties of Segnitite

Electron Density:

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

Fermion Index:

Fermion Index = 0.06
Boson Index = 0.94

Photoelectric:

PE_Segnitite= 482.13 barns/electron
U=PE_Segnitite x rElectron Density=2,064.79 barns/cc.

Radioactivity:

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

Segnitite Classification

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

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

References:

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

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 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Segnitite using:

[ALTAVISTA] [AOL] [All-The-Web] [HotBot] [Ixquick] [MAMMA] [MSN.COM] [Netscape] [Scirus] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Segnitite :

AA Mineral Specimens

B & L Fine Minerals

Crystalarium.com

Dan Weinrich Fine Minerals

Dan Weinrich Auctions

Dakota Matrix

Desert Winds Gems and Minerals

John Betts Fine Minerals

Mason's Minerals

Mineral News

Mineral of the Month Club

Wrights Rock Shop

Translate Segnitite Mineral Data :

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: