Sigloite
A valid IMA mineral species
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About Sigloite
Siglo XX Mine, underground mining scene, ca. 1910
Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia
Formula:
Fe3+Al2(PO4)2(OH)3 · 7H2O
Colour:
Light brown, straw-yellow, pale brownish orange
Hardness:
3
Specific Gravity:
2.35
Crystal System:
Triclinic
Member of:
Name:
Named after its discovery locality, the Siglo Veinte Mine (Siglo XX Mine), Llallagua, Bustillos Province, Potosí Department, Bolivia.
This page provides mineralogical data about Sigloite.
Unique Identifiers
Mindat ID:
3657
Long-form identifier:
mindat:1:1:3657:9
GUID
(UUID V4):
(UUID V4):
53817d5f-8821-4e69-802f-6122c6f9f14b
IMA Classification of Sigloite
Approved
First published:
1962
Classification of Sigloite
8.DC.30
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
8 : PHOSPHATES, ARSENATES, VANADATES
D : Phosphates, etc. with additional anions, with H2O
C : With only medium-sized cations, (OH, etc.):RO4 = 1:1 and < 2:1
42.11.14.3
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
42 : HYDRATED PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
11 : (AB)3(XO4)2Zq·xH2O
19.14.26
19 : Phosphates
14 : Phosphates of Fe and other metals
19 : Phosphates
14 : Phosphates of Fe and other metals
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 |
---|---|---|
Sig | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Sigloite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Sigloite
Transparency:
Translucent
Colour:
Light brown, straw-yellow, pale brownish orange
Hardness:
3 on Mohs scale
Cleavage:
Perfect
On {010}, perfect; on {001}, good
On {010}, perfect; on {001}, good
Density:
2.35 g/cm3 (Measured) 2.40 g/cm3 (Calculated)
Optical Data of Sigloite
Type:
Biaxial (+)
RI values:
nα = 1.563 nβ = 1.586(1) nγ = 1.619
2V:
Measured: 76° , Calculated: 82°
Max Birefringence:
δ = 0.056
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
strong
Optical Extinction:
X (90°,32°); Y (–144°,70°); Z (–46°,66°) [using (φ,ρ)]
Chemistry of Sigloite
Mindat Formula:
Fe3+Al2(PO4)2(OH)3 · 7H2O
Crystallography of Sigloite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 5.190(2) Å, b = 10.419(4) Å, c = 7.033(3) Å
α = 105.00(3)°, β = 111.31(3)°, γ = 6970.87(3)°
α = 105.00(3)°, β = 111.31(3)°, γ = 6970.87(3)°
Ratio:
a:b:c = 0.498 : 1 : 0.675
Unit Cell V:
190.03 ų (Calculated from Unit Cell)
Z:
1
Morphology:
Forms include {001}, {010}, {100}, {110}, {110}, {120}, {011}, {111}, {112}.
Crystal Structure
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2x2x2 | 3x3x3 | 4x4x4
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0014617 | Sigloite | Hawthorne F C (1988) Sigloite: The oxidation mechanism in [M2(PO4)2(OH)2(H21O)2] structures Mineralogy and Petrology 38 201-211 | 1988 | Siglo XX Mine, Llallagau, Bolivia | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Image Loading
Radiation - Copper Kα
Data courtesy of RRUFF project at University of Arizona, used with permission.
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
9.69 Å | (100) |
6.46 Å | (90) |
4.86 Å | (90) |
3.23 Å | (70) |
2.82 Å | (60) |
2.56 Å | (50) |
4.68 Å | (40b) |
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
31 : Thermally altered carbonate, phosphate, and iron formations | |
Stage 7: Great Oxidation Event | <2.4 |
47a : [Near-surface hydration of prior minerals] | |
47c : [Carbonates, phosphates, borates, nitrates] |
Type Occurrence of Sigloite
General Appearance of Type Material:
Cavities filled with straw yellow intergrowths of crystals and crystals perched on wavellite overgrowths on quartz.
Place of Conservation of Type Material:
Harvard University, Cambridge, Massachusetts, 107443; National Museum of Natural History, Washington, D.C., USA, 115320.
Associated Minerals at Type Locality:
Reference:
Hurlbut C S, Honea R (1962) Sigloite, a new mineral from Llallagua, Bolivia. American Mineralogist 47: 1-8.
Synonyms of Sigloite
Other Language Names for Sigloite
Relationship of Sigloite to other Species
Member of:
Other Members of this group:
Ferrolaueite | Fe2+Fe3+2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Gordonite | MgAl2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Kummerite | Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Laueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Mangangordonite | Mn2+Al2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Stewartite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O | Tric. 1 : P1 |
Common Associates
Associated Minerals Based on Photo Data:
399 photos of Sigloite associated with Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
101 photos of Sigloite associated with Vauxite | Fe2+Al2(PO4)2(OH)2 · 6H2O |
95 photos of Sigloite associated with Metavauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
40 photos of Sigloite associated with Wavellite | Al3(PO4)2(OH,F)3 · 5H2O |
20 photos of Sigloite associated with Pyrite | FeS2 |
17 photos of Sigloite associated with Quartz | SiO2 |
14 photos of Sigloite associated with Franckeite | Fe2+(Pb,Sn2+)6Sn4+2Sb2S14 |
8 photos of Sigloite associated with Greenockite | CdS |
5 photos of Sigloite associated with Römerite | Fe2+Fe3+2(SO4)4 · 14H2O |
1 photo of Sigloite associated with Kidwellite | NaFe3+9+x(PO4)6(OH)11 · 3H2O, x = 0.33 |
Related Minerals - Strunz-mindat Grouping
8.DC. | Ianbruceite | Zn2(AsO4)(OH) · 3H2O |
8.DC. | Césarferreiraite | Fe2+ Fe3+2(AsO4)2(OH)2 · 8H2O |
8.DC. | Ferrivauxite | Fe3+Al2(PO4)2(OH)3 · 5H2O |
8.DC.05 | Nissonite | Cu2Mg2(PO4)2(OH)2 · 5H2O |
8.DC.07 | Euchroite | Cu2(AsO4)(OH) · 3H2O |
8.DC.10 | Legrandite | Zn2(AsO4)(OH) · H2O |
8.DC.12 | Strashimirite | Cu8(AsO4)4(OH)4 · 5H2O |
8.DC.15 | Arthurite | CuFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Earlshannonite | Mn2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Ojuelaite | ZnFe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Whitmoreite | Fe2+Fe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | Cobaltarthurite | (Co,Mg)Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Bendadaite | Fe2+Fe3+2(AsO4)2(OH)2 · 4H2O |
8.DC.15 | Kunatite | CuFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UM2006-27-PO:FeHZn | ZnFe3+2(PO4)2(OH)2 · 4H2O |
8.DC.15 | UKI-2006-(PO:AlCuFeH) | Fe2+Al3+2(PO4)2(OH)2 · 4H2O |
8.DC.17 | Kleemanite | ZnAl2(PO4)2(OH)2 · 3H2O |
8.DC.20 | Bermanite | Mn2+Mn3+2(PO4)2(OH)2 · 4H2O |
8.DC.20 | Coralloite | Mn2+Mn3+2(AsO4)2(OH)2 · 4H2O |
8.DC.20 | Magnesiobermanite | MgMn3+2(PO4)2(OH)2 · 4H2O |
8.DC.22 | Kovdorskite | Mg2(PO4)(OH) · 3H2O |
8.DC.25 | Ferristrunzite | Fe3+Fe3+2(PO4)2(OH)3 · 5H2O |
8.DC.25 | Ferrostrunzite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Metavauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.25 | Metavivianite | Fe2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Strunzite | Mn2+Fe3+2(PO4)2(OH)2 · 6H2O |
8.DC.25 | Zincostrunzite | ZnFe3+2(PO4)2(OH)2 · 6.5H2O |
8.DC.27 | Beraunite | Fe3+6(PO4)4O(OH)4 · 6H2O |
8.DC.27 | Tvrdýite | Fe2+Fe3+2 Al3(PO4)4(OH)5(H2O)4 · 2H2O |
8.DC.27 | Zincoberaunite | ZnFe3+5(PO4)4(OH)5 · 6H2O |
8.DC.30 | Gordonite | MgAl2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Laueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Mangangordonite | Mn2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Paravauxite | Fe2+Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Pseudolaueite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Stewartite | Mn2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ushkovite | MgFe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Ferrolaueite | Fe2+Fe3+2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Kastningite | (Mn2+,Fe2+,Mg)Al2(PO4)2(OH)2 · 8H2O |
8.DC.30 | Maghrebite | MgAl2(AsO4)2(OH)2 · 8H2O |
8.DC.30 | Nordgauite | MnAl2(PO4)2(F,OH)2 · 5H2O |
8.DC.30 | Kayrobertsonite | [MnAl2(PO4)2(OH)2(H2O)4] · 2H2O |
8.DC.30 | Kummerite | Mn2+Fe3+Al(PO4)2(OH)2 · 8H2O |
8.DC.32 | Tinticite | Fe3+3(PO4)2(OH)3 · 3H2O |
8.DC.32 | Kamarizaite | Fe3+3(AsO4)2(OH)3 · 3H2O |
8.DC.35 | Vauxite | Fe2+Al2(PO4)2(OH)2 · 6H2O |
8.DC.37 | Vantasselite | Al4(PO4)3(OH)3 · 9H2O |
8.DC.40 | Cacoxenite | Fe3+24AlO6(PO4)17(OH)12 · 75H2O |
8.DC.45 | Gormanite | (Fe2+,Mg)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.45 | Souzalite | (Mg,Fe2+)3(Al,Fe3+)4(PO4)4(OH)6 · 2H2O |
8.DC.47 | Kingite | Al3(PO4)2F2(OH) · 7H2O |
8.DC.50 | Wavellite | Al3(PO4)2(OH,F)3 · 5H2O |
8.DC.50 | Allanpringite | Fe3+3(PO4)2(OH)3 · 5H2O |
8.DC.50 | Fluorwavellite | Al3(PO4)2(OH)2F · 5H2O |
8.DC.52 | Kribergite | Al5(PO4)3(SO4)(OH)4 · 4H2O |
8.DC.55 | Mapimite | Zn2Fe3+3(AsO4)3(OH)4 · 10H2O |
8.DC.57 | Ogdensburgite | Ca2Fe3+4(Zn,Mn2+)(AsO4)4(OH)6 · 6H2O |
8.DC.60 | Nevadaite | (Cu2+,Al,V3+)6Al8(PO4)8F8(OH)2 · 22H2O |
8.DC.60 | Cloncurryite | Cu0.5(VO)0.5Al2(PO4)2F2 · 5H2O |
8.DC.62 | Kenngottite | Mn2+3Fe3+4(PO4)4(OH)6(H2O)2 |
8.DC.67 | Molinelloite | Cu(H2O)(OH)V4+O(V5+O4) |
8.DC.70 | Whitecapsite | H16Fe2+5Fe3+14Sb3+6(AsO4)18O16 · 120H2O |
8.DC.75 | Heimite | PbCu2(AsO4)(OH)3 · 2H2O |
8.DC.80 | Lednevite | Cu[PO3(OH)] · H2O |
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 Sigloite
mindat.org URL:
https://www.mindat.org/min-3657.html
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References for Sigloite
Reference List:
Hurlbut, Cornelius S., Honea, Russell (1962) Sigloite, a new mineral from Llallagua, Bolivia. American Mineralogist, 47 (1-2) 1-8
Jambor, John L., Burke, Ernst A. J. (1989) New Mineral Names. American Mineralogist, 74 (11-12) 1399-1404 p.1404
Frost, Ray L., Xi, Yunfei, Scholz, Ricardo, Belotti, Fernanda Maria, Filho, Mauro Cândido (2013) The phosphate mineral sigloite Fe3+Al2(PO4)2(OH)3·7(H2O), an exception to the paragenesis rule – A vibrational spectroscopic study. Journal of Molecular Structure, 1033. 258-264 doi:10.1016/j.molstruc.2012.10.020
Localities for Sigloite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Bolivia (TL) | |
| Mineralogical Record: 32: 474. +2 other references |
France | |
| Lheur et al. (2013) |
USA | |
| Josef Vajdak (2002) |
| Kenny Gay collection |
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Siglo Veinte Mine, Llallagua, Rafael Bustillo Province, Potosí, Bolivia