Segnitite
A valid IMA mineral species
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About Segnitite
Edgar Ralph Segnit
Formula:
PbFe3+3AsO4(AsO3OH)(OH)6
May contain, as other Fe(III) members, minor Sb, Cu and Zn substituting for Fe.
Colour:
Greenish to yellowish-brown
Lustre:
Adamantine, Vitreous
Hardness:
4
Specific Gravity:
4.2
Crystal System:
Trigonal
Member of:
Name:
Named in honor of Edgar Ralph Segnit (5 September 1923, Adelaide, South Australia, Australia - 13 July 1999, Melbourne, Australia), geologist and gemmologist at CSIRO Division of Mineral Chemistry in Melbourne, for his contributions to Australian mineralogy.
The arsenate analogue of kintoreite.
Difficult to distinguish from beudantite, with which it forms a series.
Related to kolitschite.
Difficult to distinguish from beudantite, with which it forms a series.
Related to kolitschite.
Unique Identifiers
Mindat ID:
3606
Long-form identifier:
mindat:1:1:3606:7
IMA Classification of Segnitite
Classification of Segnitite
8.BL.10
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
L : With medium-sized and large cations, (OH, etc.):RO4 = 3:1
42.7.4.4
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
7 : (AB)2(XO4)Zq·xH2O
20.5.13
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
20 : Arsenates (also arsenates with phosphate, but without other anions)
5 : Arsenates of Ti and Pb
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Sgt | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Segnitite
Adamantine, Vitreous
Transparency:
Transparent, Translucent
Colour:
Greenish to yellowish-brown
Streak:
Pale yellow
Hardness:
4 on Mohs scale
Tenacity:
Brittle
Cleavage:
Distinct/Good
Good on {0001}
Good on {0001}
Fracture:
Irregular/Uneven
Density:
4.2 g/cm3 (Measured) 4.77 g/cm3 (Calculated)
Optical Data of Segnitite
Type:
Uniaxial (-)
RI values:
nω = 1.975 nε = 1.955
Max. Birefringence:
δ = 0.020
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars.
Surface Relief:
Moderate
Pleochroism:
Weak
Comments:
Pale to medium yellow.
Chemistry of Segnitite
Mindat Formula:
PbFe3+3AsO4(AsO3OH)(OH)6
May contain, as other Fe(III) members, minor Sb, Cu and Zn substituting for Fe.
May contain, as other Fe(III) members, minor Sb, Cu and Zn substituting for Fe.
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| PbO | 28.13 % |
| ZnO | 0.21 % |
| Fe2O3 | 32.04 % |
| As2O5 | 28.83 % |
| SO3 | 0.86 % |
| H2O calc | 7.94 % |
| Total: | 98.01 % |
Sample references:
Crystallography of Segnitite
Crystal System:
Trigonal
Class (H-M):
3m (3 2/m) - Hexagonal Scalenohedral
Space Group:
R3m
Cell Parameters:
a = 7.359(3) Å, c = 17.113(8) Å
Ratio:
a:c = 1 : 2.325
Unit Cell V:
802.59 ų (Calculated from Unit Cell)
Z:
3
Morphology:
Rhombohedral (mainly acute rhombohedra), pseudo-octahedral, pseudo-cubic or tabular crystals; very rarely also acicular.
The principal forms present in the type material are {112} and {001}.
The principal forms present in the type material are {112} and {001}.
Twinning:
None observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.092 Å | (100) |
| 5.966 Å | (50) |
| 3.678 Å | (40) |
| 2.283 Å | (30) |
| 1.992 Å | (30) |
| 1.840 Å | (25) |
| 2.849 Å | (20) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47c : [Carbonates, phosphates, borates, nitrates] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Geological Setting:
Rare mineral found in the oxidation zone of hydrothermal ore deposits.
Type Occurrence of Segnitite
General Appearance of Type Material:
Greenish brown to yellowish brown, pseudo-octahedral crystals up to 1 mm across, and as aggregates, crusts and clusters of yellowish brown rhombohedral crystals up to 5 mm high.
Place of Conservation of Type Material:
Museum Victoria, Melbourne, Australia, M30044.
Geological Setting of Type Material:
Oxidation of primary ore rich in galena and arsenopyrite-loellingite.
Associated Minerals at Type Locality:
Synonyms of Segnitite
Other Language Names for Segnitite
Relationship of Segnitite to other Species
Member of:
Other Members of Dussertite Group:
| Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) |
| Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| 'Arsenoflorencite-(Nd)' | NdAl3(AsO4)2(OH)6 | Trig. |
| Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| 'Arsenowaylandite' | BiAl3(AsO4)2(OH)6 | Trig. |
| Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
| Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Karlseifertite | Pb(Ga2Ge)(AsO4)2(OH)6 | Trig. 3m (3 2/m) : R3m |
| Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 | Trig. 3m (3 2/m) : R3m |
Forms a series with:
Common Associates
Associations Based on Photo Data:
| 165 photos of Segnitite associated with Carminite | PbFe3+2(AsO4)2(OH)2 |
| 58 photos of Segnitite associated with Mimetite | Pb5(AsO4)3Cl |
| 42 photos of Segnitite associated with Quartz | SiO2 |
| 40 photos of Segnitite associated with Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
| 34 photos of Segnitite associated with Scorodite | Fe3+AsO4 · 2H2O |
| 19 photos of Segnitite associated with Goethite | Fe3+O(OH) |
| 11 photos of Segnitite associated with Bayldonite | PbCu3(AsO4)2(OH)2 |
| 11 photos of Segnitite associated with Arsenbrackebuschite | Pb2Fe3+(AsO4)2(OH) |
| 10 photos of Segnitite associated with Duftite | PbCu(AsO4)(OH) |
| 9 photos of Segnitite associated with Mawbyite | PbFe3+2(AsO4)2(OH)2 |
Related Minerals - Strunz-mindat Grouping
| 8.BL. | Kiryuite | NaMnAl(PO4)F3 |
| 8.BL. | Metaheimite | PbCu2(AsO4)(OH)3 |
| 8.BL. | Graulichite-(La) | LaFe3+3(AsO4)2(OH)6 |
| 8.BL. | Cloudite | BaFe3+3(PO4)(SO4)(OH)6 |
| 8.BL. | Oberwolfachite | SrFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL. | Arsenobenauite | SrFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.05 | Gallobeudantite | PbGa3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Slottaite | SrFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Corkite | PbFe3+3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Hidalgoite | PbAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Hinsdalite | PbAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | 'UM2011-07-POSO:AlBaH' | BaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Kemmlitzite | SrAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Beudantite | PbFe3+3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Weilerite | BaAl3(AsO4)(SO4)(OH)6 |
| 8.BL.05 | Woodhouseite | CaAl3(PO4)(SO4)(OH)6 |
| 8.BL.05 | Svanbergite | SrAl3(PO4)(SO4)(OH)6 |
| 8.BL.10 | Arsenogoyazite | SrAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Arsenogorceixite | BaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Dussertite | BaFe3+3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Galloplumbogummite | Pb(Ga,Al,Ge)3(PO4)2(OH)6 |
| 8.BL.10 | Stibiosegnitite | Pb(Fe3+2.5Sb5+0.5)(AsO4)2(OH)6 |
| 8.BL.10 va | 'Viséite' | |
| 8.BL.10 | Arsenocrandallite | CaAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Benauite | SrFe3+3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Philipsbornite | PbAl3(AsO4)(AsO3OH)(OH)6 |
| 8.BL.10 | Crandallite | CaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Springcreekite | BaV3+3(PO4)2(OH,H2O)6 |
| 8.BL.10 | Eylettersite | Th0.75Al3(PO4)2(OH)6 |
| 8.BL.10 | Kintoreite | PbFe3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Plumbogummite | PbAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Gorceixite | BaAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.10 | Goyazite | SrAl3(PO4)(PO3OH)(OH)6 |
| 8.BL.13 | Florencite-(Ce) | CeAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(La) | LaAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Nd) | NdAl3(PO4)2(OH)6 |
| 8.BL.13 | Zaïrite | BiFe3+3(PO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(La) | LaAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenoflorencite-(Nd)' | NdAl3(AsO4)2(OH)6 |
| 8.BL.13 | 'Unnamed (As-analogue of Zaïrite)' | (Bi,Pb)Fe3+3(AsO4)2(OH)6 |
| 8.BL.13 | Arsenoflorencite-(Ce) | CeAl3(AsO4)2(OH)6 |
| 8.BL.13 | Graulichite-(Ce) | CeFe3+3(AsO4)2(OH)6 |
| 8.BL.13 | 'Arsenowaylandite' | BiAl3(AsO4)2(OH)6 |
| 8.BL.13 | Waylandite | BiAl3(PO4)2(OH)6 |
| 8.BL.13 | Florencite-(Sm) | SmAl3(PO4)2(OH)6 |
| 8.BL.15 | Viitaniemiite | Na(Ca,Mn2+)Al(PO4)(F,OH)3 |
| 8.BL.25 | Pattersonite | PbFe3+3(PO4)2(OH)5 · H2O |
Fluorescence of Segnitite
Not fluorescent.
Other Information
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Segnitite
mindat.org URL:
https://www.mindat.org/min-3606.html
Please feel free to link to this page.
Please feel free to link to this page.
Search Engines:
External Links:
Mineral Dealers:
References for Segnitite
Reference List:
Birch, W. D., Pring, A., Gatehouse, B. M. (1992) Segnitite, PbFe3H(AsO4)2(OH)6, a new mineral in the lusungite group from Broken Hill, New South Wales, Australia. American Mineralogist, 77 (5-6) 656-659
Sejkora, J., Škovíra, J., Čejka, J., Plášil, J. (2009) Cu-rich members of the beudantite-segnitite series from the Krupka ore district, the Krušné hory Mountains, Czech Republic. Journal of GEOsciences, 54 (4) 355-371
Pekov, I. V., Khanin, D. A., Yapaskurt, V. O., Pakunova, A. V., Ekimenkova, I. A. (2016) Minerals of the beudantite–segnitite series from the oxidation zone of the Berezovskoe gold deposit, middle Urals: Chemical variations, behavior of admixtures, and antimonian varieties. Geology of Ore Deposits, 58 (7) 600-611 doi:10.1134/s1075701516070096[English version of Pekov et al., 2015]
Localities for Segnitite
Showing 213 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Australia | |
| Ashley et al. (1999) |
| Rankin et al. (2002) |
| John Haupt collection | |
| Leverett et al. (2003) |
| Birch et al. (1992) +1 other reference |
| |
| Parbhakar-Fox (2016) |
| Parbhakar-Fox (2016) | |
| Kolitsch et al. (1999) |
| Bottrill (2018) |
| R Bottrill collection |
| R Bottrill | |
| Museum Victoria collection |
| Mineralogical Society of America - ... |
Austria | |
| Auer (2023) |
| C.Auer (2024) |
| Carinthia II (2017) |
| Kolitsch (2015) |
| Kolitsch et al. (2010) |
| Kolitsch et al. (2019) |
| Kutil (2004) |
| Bernhard (2012) |
| Tomazic (1999) |
| Bojar (2004) |
| C.Auer (2016) |
| Auer (2016) | |
Brazil | |
| Moura et al. (2007) +1 other reference |
Bulgaria | |
| Petrov et al. (xxxx) |
Canada | |
| Norman Wilson collection |
Chile | |
| Dr. Robert A. Jenkins collection |
| Samples analysed by Dr. Jochen Schlüter (Hamburg University) |
| Samples analysed by Dr. Jochen Schluter et al. (Salzburg Department of Mineralogy) |
Czech Republic | |
| C.Auer (2016) |
| Sejkora et al. (2011) |
| Sejkora et al. (2011) |
| Rojík (2005) |
| Dolníček (2018) |
| Vrtiška et al. (2024) |
| C.Auer (2016) |
| VÍŠKOVÁ et al. (2022) |
Europe | |
| Jansa et al. (1998) +2 other references |
France | |
| SEM-EDS analysed by Chollet Pascal at ... |
| Uwe Kolitsch (SXRD + SEM-EDS) |
| Cuchet et al. (2000) | |
| Jean-Luc Portes Collection |
| SEM-EDS analyses at "Laboratoire Magmas ... |
| Chollet Pascal Collection +1 other reference | |
| Y. Vessely collection |
| SEM-EDS analysed at Laboratoire "Magmas ... |
| Boisson J.-M. et al. (2023) +1 other reference |
| Wittern et al. (1997) |
| Mines |
| Georges FAVREAU collection & EDX ... +1 other reference |
| Favreau et al. (2010) |
| Favreau et al. (2024) |
| Georges FAVREAU collection & EDX ... +1 other reference | |
Germany | |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (2001) |
| Walenta (1992) |
| Walenta (1992) |
| Gruber (2000) +1 other reference | |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (1992) | |
| Walenta (1992) |
| Walenta (1996) |
| www.mineralienatlas.de (2021) |
| [Wittern (1995) |
| Walenta (1992) |
| [Wittern (1995) |
| Walenta (1992) |
| Walenta (1994) +1 other reference |
| Wittern (2001) |
| Walenta (1992) |
| Walenta (1996) |
| Wittern (2001) |
| Walenta (1992) |
| Walenta (1992) |
| Walenta (1992) | |
| Walenta (1992) |
| Belendorff (2021) |
| Bischoff (1999) |
| Gröbner (2007) |
| Gröbner et al. (2011) |
| Henrich et al. (2019) |
| www.mineralienatlas.de (2025) |
| Rolf Golze +3 other references | |
| Identified by Gerhard Möhn and Joy ... |
| Johannes Markus Henrich +2 other references |
| Lapis 38 (5) +1 other reference |
| Martin et al. (1994) |
| Wittern (2001) | |
Greece | |
| Blaß et al. (1998) |
| Chollet Pascal | |
| Rieck (n.d.) | |
| |
| Rieck (1999) | |
| Rieck (n.d.) | |
| Rieck (n.d.) |
| |
| Branko Rieck and Uwe Kolitsch ... |
| |
| Blaß et al. (1998) |
| Wendel et al. (1999) | |
Hungary | |
| Acta Min. Petro. (Szeged) |
| collection: Herman Ottó Museum |
| Sándor et al. (2005) |
| |
| Sándor et al. (2005) |
| Szakáll: Minerals of Szár Hill |
| AMP |
| Szakáll et al. (1996) |
| HOM Collection | |
Italy | |
| Bortolozzi et al. (2018) |
| Bortolozzi et al. (2015) |
| C. Balestra - SIUK-AMI - characterized ... |
| C. Balestra | |
| Vergani et al. (2020) |
| Carmagnola et al. (2019) |
| Vergani et al. (2020) |
| Vergani et al. (2020) | |
| Gentile et al. (2012) |
| Gentile et al. (2023) |
| Gentile et al. (2023) |
| Giuseppe Finello collection |
| Giuseppe Finello find & collection (SEM- EDS) | |
| Piccoli et al. (2007) |
| SEM/EDS 18/09/2001 MNHN-Paris |
| ALBERTINI C. (2014) |
| Cuchet et al. (2019) |
| Identificata da Italo Campostrini ... |
| //doi.org/10.57635/MICRO.2025.23.16 |
| Daniel Lorenz |
| Ferretti et al. (2017) |
| "Dario Cericola (SEM/EDX) |
| Bortolozzi et al. (2021) |
| Rocchetti I. (2012) |
| Bortolozzi et al. (2013) |
| Gasparetto et al. (2014) |
| Erica Bittarello +3 other references |
Japan | |
| Matsubara & Matsuyama (1997) |
| Yamada (2005) |
| Shibata et al (1998) |
Mexico | |
| Moore et al. (2003) |
Namibia | |
| Schnaitmann et al. (2007) |
| Collection of NHM +1 other reference | |
| Gebhard (1999) +1 other reference |
Norway | |
| Husdal (2019) |
| Husdal et al. (2019) |
Poland | |
| Gołębiowska B. (Al,Fe3+) |
| Siuda et al. (2003) |
Portugal | |
| Marques de Sá et al. (2010) |
| Alves (n.d.) |
| Alves (n.d.) |
| Alves (n.d.) |
| Pedro Alves analytical data |
| Pedro Alves analytical data and technical report (confidential) |
| |
| Alves (n.d.) |
| Leal Gomes | |
| Nuno Afonso collection (XRD-analysed) |
| Pedro Alves collection. Characterized ... |
| Alves (n.d.) +1 other reference |
| Ko Jansen collection |
Russia | |
| Kasatkin et al. (2025) |
| Pekov et al. (2016) |
| Kasatkin et al. (2014) |
Slovakia | |
| Vlasáč et al. (2021) |
| Martin Števko-unpublished |
| Ondrejka et al. (2024) |
| Števko et al. (2025) |
| Radková P. et al. (2019) |
Spain | |
| Georges FAVREAU collection & EDX ... |
| José Miguel Sola. DRX Uni. Of Granada (Spain) | |
| Calvo (2015) |
| Calvo (2015) | |
| Miguel Calvo Rebollar (2015) |
| Rewitzer et al. (2016) +1 other reference |
| Rewitzer et al. (2018) |
| Gröbner et al. (1999) |
| Calvo Sevillano et al. (2012) |
| Abella i Creus (2018) |
| Joan Abella i Creus |
| Joan Abella i Creus specimen |
| Sainz de Baranda Graf et al. (2023) |
| Calvo Sevillano et al. (2012) +1 other reference |
| Calvo Sevillano et al. (2012) |
Switzerland | |
| Roth et al. (2025) |
| Roth et al. (2022) | |
| |
| Ansermet (2012) |
| EDXS analyses et al. (no sulfate, Fe>>Al) | |
Thailand | |
| Shen (n.d.) +1 other reference |
| Sacchi (2017) +1 other reference |
UK | |
| De Bondt (n.d.) |
| Golley et al. (1995) |
| - (2006) |
| Green et al. (2008) |
| Cotterell et al. (2011) |
USA | |
| Ron Layton Collection |
| Ream (2005) |
| Mills et al. (2010) +1 other reference |
| Marco Ciriotti collection (analysed by SEM-EDS, 2005) |
| Excalibur Mineral Corp. - Mineral News |
| Jensen et al. (2010) |
| Martin C. Jensen Collection |
| Anthony Kampf |
| King et al. (1995) |
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Alto das Quelhas do Gestoso Mine, Gestoso, Manhouce, São Pedro do Sul, Viseu, Portugal